Content Update: March 2018 (Government & Politics, Econ, Stats, Physics, Bio, and MORE!)

We had a great month for content updates, with a bunch of new items in many of our high school subjects, as well as more additions to our great Careers series. Check them out below and let us know what you think!

Domain	Subject	Content kind	Title	URL
Arts and humanities	Ancient Mediterranean	Video	Who owns the Parthenon sculptures?	http://www.khanacademy.org/humanities/ancient-art-civilizations/greek-art/classical/v/who-owns-the-parthenon-sculptures
Arts and humanities	AP US Government and Politics	Article	AP free response tips	http://www.khanacademy.org/humanities/ap-us-government-and-politics/prepare-for-the-2018-ap-exam/a/free-response-tips
Arts and humanities	AP US Government and Politics	Article	What's the 2018 US Government and Politics exam format?	http://www.khanacademy.org/humanities/ap-us-government-and-politics/prepare-for-the-2018-ap-exam/a/whats-the-2018-gopo-exam-format
Arts and humanities	AP US Government and Politics	Article	How to practice with our multiple choice questions	http://www.khanacademy.org/humanities/ap-us-government-and-politics/prepare-for-the-2018-ap-exam/a/multiple-choice-questions
Arts and humanities	AP US Government and Politics	Article	Submit your questions about the 2018 US Government and Politics Exam	http://www.khanacademy.org/humanities/ap-us-government-and-politics/prepare-for-the-2018-ap-exam/a/submit-your-questions-about-the-2018-usgopo-exam
Arts and humanities	AP US Government and Politics	Article	Lesson summary: checks on the judicial branch	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-judicial-branch/a/lesson-summary-checks-on-the-judicial-branch
Arts and humanities	AP US Government and Politics	Video	Executive and legislative disagreements with the Supreme Court	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-judicial-branch/v/executive-and-legislative-disagreements-with-supreme-court
Arts and humanities	AP US Government and Politics	Video	Judicial activism and judicial restraint	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-judicial-branch/v/judicial-activism-vs-judicial-restraint
Arts and humanities	AP US Government and Politics	Exercise	The Court in action	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-judicial-branch/e/the-court-in-action
Arts and humanities	AP US Government and Politics	Exercise	Checks on the judicial branch	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-judicial-branch/e/checks-on-the-judicial-branch
Arts and humanities	AP US Government and Politics	Article	Lesson summary: checks on the presidency	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-presidency/a/lesson-summary-checks-on-the-presidency
Arts and humanities	AP US Government and Politics	Exercise	Checks on the presidency	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-presidency/e/checks-on-the-presidency
Arts and humanities	AP US Government and Politics	Video	Senate checks on presidential appointments	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/checks-on-the-presidency/v/senate-checks-on-presidential-appointments
Arts and humanities	AP US Government and Politics	Article	Lesson summary: the Senate and the House of Representatives	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congress-the-senate-and-the-house-of-representatives/a/lesson-summary-the-senate-and-the-house-of-representatives
Arts and humanities	AP US Government and Politics	Article	Lesson summary: congressional behavior	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congressional-behavior/a/lesson-summary-congressional-behavior
Arts and humanities	AP US Government and Politics	Video	Divided government and gridlock in the United States	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/congressional-behavior/v/divided-government-and-gridlock-in-the-united-states
Arts and humanities	AP US Government and Politics	Video	Expansion of presidential power	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/expansion-of-presidential-power/v/expansion-of-presidential-power-video
Arts and humanities	AP US Government and Politics	Article	Lesson summary: expansion of presidential power	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/expansion-of-presidential-power/a/lesson-summary-expansion-of-presidential-power
Arts and humanities	AP US Government and Politics	Article	Lesson summary: presidential communication	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/presidential-communication/a/lesson-summary-presidential-communication
Arts and humanities	AP US Government and Politics	Video	The Presidents' bully pulpit	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/presidential-communication/v/presidents-bully-pulpit
Arts and humanities	AP US Government and Politics	Exercise	Presidential communication	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/presidential-communication/e/presidential-communication
Arts and humanities	AP US Government and Politics	Article	Lesson summary: structures, powers, and functions of congress	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/structures-powers-and-functions-of-congress/a/lesson-summary-structures-powers-and-functions-of-congress
Arts and humanities	AP US Government and Politics	Video	Congressional oversight of the bureaucracy	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/discretionary-and-rule-making-authority/v/congressional-oversight-of-bureaucracy
Arts and humanities	AP US Government and Politics	Video	Discretionary and rulemaking authority of the federal bureaucracy	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/discretionary-and-rule-making-authority/v/discretionary-rule-making-authority-of-the-federal-bureaucracy
Arts and humanities	AP US Government and Politics	Article	Lesson summary: authority and accountability of the bureaucracy	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/discretionary-and-rule-making-authority/a/discretionary-and-rule-making-authority-lesson-overview
Arts and humanities	AP US Government and Politics	Exercise	The bureaucracy: authority and accountability	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/discretionary-and-rule-making-authority/e/discretionary-and-rule-making-authority
Arts and humanities	AP US Government and Politics	Video	Iron triangles and issue networks	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/the-bureaucracy/v/iron-triangles-and-issue-networks
Arts and humanities	AP US Government and Politics	Video	Introduction to the federal bureaucracy	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/the-bureaucracy/v/introduction-to-the-federal-bureaucracy
Arts and humanities	AP US Government and Politics	Exercise	The bureaucracy: functions and responsibilities	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/the-bureaucracy/e/the-bureaucracy
Arts and humanities	AP US Government and Politics	Article	Lesson summary: functions and responsibilities of the bureaucracy	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/the-bureaucracy/a/lesson-summary-functions-and-responsibilities-of-the-bureaucracy
Arts and humanities	AP US Government and Politics	Article	Lesson summary: the judicial branch	http://www.khanacademy.org/humanities/ap-us-government-and-politics/interactions-among-branches-of-government/the-judicial-branch/a/lesson-summary-the-judicial-branch
Arts and humanities	Art of Asia	Video	Jiz≈ç Bosatsu	http://www.khanacademy.org/humanities/art-asia/art-japan/kamakura-period/v/jiz-bosatsu-kamakura-period-japan
Arts and humanities	Art of Asia	Video	Bamboo in the Four Seasons: painting and poetry in Japan	http://www.khanacademy.org/humanities/art-asia/art-japan/muromachi-period/v/bamboo-in-the-four-seasons-painting-and-poetry-in-japan
Arts and humanities	Art of the Americas to World War I	Article	Hiram Powers, The Greek Slave	http://www.khanacademy.org/humanities/art-americas/us-art-19c/us-19c-arch-sculp-photo/a/hiram-powers-the-greek-slave
Arts and humanities	Art of the Americas to World War I	Article	Introduction to the Aztecs (Mexica)	http://www.khanacademy.org/humanities/art-americas/early-cultures/aztec-mexica/a/introduction-to-the-aztecs-mexica
Arts and humanities	Art of the Americas to World War I	Video	Wendy Red Star, 1880 Crow Peace Delegation	http://www.khanacademy.org/humanities/art-americas/native-north-america/native-american-contemporary-art/v/peace-delegation
Arts and humanities	Art of the Americas to World War I	Video	Clarissa Rizal, Resilience Robe	http://www.khanacademy.org/humanities/art-americas/native-north-america/native-american-contemporary-art/v/speaking-to-both-the-past-and-present-clarissa-rizals-resilience-robe
Arts and humanities	Baroque to Neoclassical art in Europe	Article	Juan Mart√≠nez Monta√±√©s and Francisco Pacheco, Christ of Clemency	http://www.khanacademy.org/humanities/monarchy-enlightenment/baroque-art1/spain/a/juan-martnez-montas-and-francisco-pacheco-christ-of-clemency
Arts and humanities	Medieval Europe + Byzantine	Video	Plunder, war, and the Horses of San Marco	http://www.khanacademy.org/humanities/medieval-world/byzantine1/venice-ravenna/v/plunder-war-and-the-horses-of-san-marco
Arts and humanities	Modernisms 1900-1980	Video	Strange Worlds, immigration in the early 20th century	http://www.khanacademy.org/humanities/art-1010/art-between-wars/american-art-wwii/v/strange-worlds-immigration-in-the-early-20th-century
Arts and humanities	Prehistoric art in Europe and West Asia	Video	The Jericho Skull	http://www.khanacademy.org/humanities/prehistoric-art/neolithic-art/v/the-oldest-portrait-in-the-british-museum-probably-curators-corner-season-2-episode-1
Arts and humanities	Prehistoric art in Europe and West Asia	Video	Lion Man	http://www.khanacademy.org/humanities/prehistoric-art/paleolithic-art/v/living-with-gods-the-40000-year-old-lion-man
Arts and humanities	Special topics in art history	Article	Conservation vs. restoration: the Palace at Knossos (Crete)	http://www.khanacademy.org/humanities/special-topics-art-history/arches-at-risk-cultural-heritage-education-series/arches-beginners-guide/a/conservation-vs-restoration-the-palace-at-knossos-crete
Arts and humanities	Special topics in art history	Video	A Landmark Decision: Penn Station, Grand Central, and the architectural heritage of NYC	http://www.khanacademy.org/humanities/special-topics-art-history/arches-at-risk-cultural-heritage-education-series/endangered-heritage-the-americas/v/a-landmark-decision-penn-station-grand-central-and-the-architectural-heritage-of-nyc
Arts and humanities	Special topics in art history	Article	What you can do to help preserve and protect cultural heritage	http://www.khanacademy.org/humanities/special-topics-art-history/arches-at-risk-cultural-heritage-education-series/trafficking-protection/a/what-you-can-do-to-help-preserve-and-protect-cultural-heritage
College, careers, and more	Careers	Video	Film director: My budget and planning for the future	http://www.khanacademy.org/college-careers-more/career-content/design-create-perform/film-director/v/olivia-film-director-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Video	Film director: How I got my job and where I'm going	http://www.khanacademy.org/college-careers-more/career-content/design-create-perform/film-director/v/olivia-film-director-how-i-got-my-job-and-where-im-going
College, careers, and more	Careers	Video	Film director: What I do and how much I make	http://www.khanacademy.org/college-careers-more/career-content/design-create-perform/film-director/v/olivia-film-director-what-i-do-and-how-much-i-make
College, careers, and more	Careers	Video	Teacher leader: What I do and how much I make	http://www.khanacademy.org/college-careers-more/career-content/educate/teacher-leader/v/teacher-leader-what-i-do-and-how-much-i-make
College, careers, and more	Careers	Video	Teacher leader: How I got my job and where I'm going	http://www.khanacademy.org/college-careers-more/career-content/educate/teacher-leader/v/teacher-leader-how-i-got-my-job-and-where-im-going
College, careers, and more	Careers	Video	Teacher leader: My budget and planning for the future	http://www.khanacademy.org/college-careers-more/career-content/educate/teacher-leader/v/teacher-leader-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Video	Audio engineer: How I got my job and where I'm going	http://www.khanacademy.org/college-careers-more/career-content/career-profiles-start-a-business/freelance-audio-engineer/v/audio-engineer-how-i-got-my-job-and-where-im-going
College, careers, and more	Careers	Video	Audio engineer: Running a freelance business	http://www.khanacademy.org/college-careers-more/career-content/career-profiles-start-a-business/freelance-audio-engineer/v/audio-engineer-running-a-freelance-business
College, careers, and more	Careers	Video	Audio engineer: What I do and how much I make	http://www.khanacademy.org/college-careers-more/career-content/career-profiles-start-a-business/freelance-audio-engineer/v/audio-engineer-what-i-do-and-how-much-i-make
College, careers, and more	Careers	Video	Audio engineer: My budget and planning for the future	http://www.khanacademy.org/college-careers-more/career-content/career-profiles-start-a-business/freelance-audio-engineer/v/audio-engineer-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Video	Physical therapist: How I got my job and where I'm going	http://www.khanacademy.org/college-careers-more/career-content/support-health-and-wellness/physical-therapist/v/physical-therapist-how-i-got-my-job-and-where-im-going
College, careers, and more	Careers	Video	Physical therapist: How I paid for college and physical therapy school	http://www.khanacademy.org/college-careers-more/career-content/support-health-and-wellness/physical-therapist/v/physical-therapist-how-i-paid-for-college-and-physical-therapy-school
College, careers, and more	Careers	Video	Physical therapist: My budget and planning for the future	http://www.khanacademy.org/college-careers-more/career-content/support-health-and-wellness/physical-therapist/v/physical-therapist-my-budget-and-planning-for-the-future
College, careers, and more	Careers	Video	Physical therapist:What I do and how much I make	http://www.khanacademy.org/college-careers-more/career-content/support-health-and-wellness/physical-therapist/v/physical-therapist-what-i-do-and-how-much-i-make
Economics and finance	AP Macroeconomics	Article	Submit your questions about the 2018 AP Macroeconomics exam	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/prepare-for-the-2018-ap-macro-exam/a/submit-your-questions-about-the-2018-ap-macroeconomics-exam
Economics and finance	AP Macroeconomics	Article	AP Free response tips	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/prepare-for-the-2018-ap-macro-exam/a/ap-free-response-tips
Economics and finance	AP Macroeconomics	Article	What's the 2018 Macroeconomics exam format?	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/prepare-for-the-2018-ap-macro-exam/a/whats-the-2018-ap-macroeconomics-exam-format
Economics and finance	AP Macroeconomics	Article	How to practice with our multiple choice questions	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/prepare-for-the-2018-ap-macro-exam/a/how-to-practice-with-our-macro-multiple-choice-questions
Economics and finance	AP Macroeconomics	Video	Winners and losers from inflation and deflation	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/economic-iondicators-and-the-business-cycle/costs-of-inflation/v/winners-and-losers-from-inflation-and-deflation-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Video	Example question calculating CPI and inflation	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/economic-iondicators-and-the-business-cycle/price-indices-and-inflation/v/example-question-calculating-cpi-and-inflation-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Article	Banking and the expansion of the money supply	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/banking-and-the-expansion-of-the-money-supply-ap/a/banking-and-the-expansion-of-the-money-supply
Economics and finance	AP Macroeconomics	Video	Money creation in a fractional reserve system	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/banking-and-the-expansion-of-the-money-supply-ap/v/money-creation-in-a-fractional-reserve-system-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Exercise	Fractional reserve banking	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/banking-and-the-expansion-of-the-money-supply-ap/e/fractional-reserve-banking
Economics and finance	AP Macroeconomics	Exercise	The money multiplier	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/banking-and-the-expansion-of-the-money-supply-ap/e/the-money-multiplier
Economics and finance	AP Macroeconomics	Article	Definition, measurement, and functions of money	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/definition-measurement-and-functions-of-money-ap/a/definition-measurement-and-functions-of-money
Economics and finance	AP Macroeconomics	Exercise	Definition, measurement, and functions of money	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/definition-measurement-and-functions-of-money-ap/e/definition--measurement--and-functions-of-money
Economics and finance	AP Macroeconomics	Article	Lesson Summary: Financial assets	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/financial-assets-ap/a/lesson-summary-financial-assets
Economics and finance	AP Macroeconomics	Exercise	Financial assets	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/financial-assets-ap/e/financial-assets
Economics and finance	AP Macroeconomics	Article	Nominal vs. real interest rates	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/nominal-v-real-interest-rates-ap/a/nominal-vs-real-interest-rates
Economics and finance	AP Macroeconomics	Exercise	Nominal v. real interest rates	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/ap-financial-sector/nominal-v-real-interest-rates-ap/e/nominal-v--real-interest-rates
Economics and finance	AP Macroeconomics	Article	Lesson summary: automatic stabilizers	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/automatic-stabilizers-ap/a/lesson-summary-automatic-stabilizers
Economics and finance	AP Macroeconomics	Video	Automatic stabilizers	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/automatic-stabilizers-ap/v/automatic-stabilizers-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Exercise	Automatic stabilizers	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/automatic-stabilizers-ap/e/automatic-stabilizers
Economics and finance	AP Macroeconomics	Article	Lesson summary: Changes in the AD-AS model in the short run	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/changes-in-the-ad-as-model-in-the-short-run-ap/a/lesson-summary-changes-in-the-ad-as-model-in-the-short-run
Economics and finance	AP Macroeconomics	Exercise	Changes in the AD-AS model in the short run	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/changes-in-the-ad-as-model-in-the-short-run-ap/e/changes-in-the-ad-as-model-in-the-short-run
Economics and finance	AP Macroeconomics	Video	Short run and long run equilibrium and the business cycle	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/equilibrium-in-the-ad-as-model-ap/v/short-run-and-long-run-equilibrium-and-the-business-cycle-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Exercise	Equilibrium in the AD-AS model	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/equilibrium-in-the-ad-as-model-ap/e/equilibrium-in-the-ad-as-model
Economics and finance	AP Macroeconomics	Article	Lesson summary: Fiscal policy	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/fiscal-policy-ap/a/lesson-summary-fiscal-policy
Economics and finance	AP Macroeconomics	Video	Calculating change in spending or taxes to close output gaps	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/fiscal-policy-ap/v/calculating-change-in-spending-or-taxes-to-close-output-gaps
Economics and finance	AP Macroeconomics	Video	Fiscal policy to address output gaps	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/fiscal-policy-ap/v/fiscal-policy-to-address-output-gaps-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Exercise	Fiscal policy	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/fiscal-policy-ap/e/fiscal-policy
Economics and finance	AP Macroeconomics	Article	Lesson summary: Long run self-adjustment in the AD-AS model	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/long-run-self-adjustment-ap/a/lesson-summary-long-run-self-adjustment-in-the-ad-as-model
Economics and finance	AP Macroeconomics	Video	Long run self adjustment	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/long-run-self-adjustment-ap/v/long-run-self-adjustment-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Exercise	Long run self-adjustment in the AD-AS model	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/long-run-self-adjustment-ap/e/long-run-self-adjustment-in-the-ad-as-model
Economics and finance	AP Macroeconomics	Video	Tax multiplier, MPC, and MPS	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/multipliers-ap/v/tax-multiplier-mpc-and-mps-ap-macroeconomics-khan-academy
Economics and finance	AP Macroeconomics	Exercise	Expenditure and Tax Multipliers	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/multipliers-ap/e/expenditure-and-tax-multipliers
Economics and finance	AP Macroeconomics	Article	Lesson summary: Short-run aggregate supply	http://www.khanacademy.org/economics-finance-domain/ap-macroeconomics/national-income-and-price-determinations/short-run-aggregate-supply-ap/a/lesson-summary-short-run-aggregate-supply
Math	4th grade	Video	Adding multi-digit numbers: 48,029+233,930	http://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-adding-carrying/v/adding-multi-digit-numbers-with-regrouping
Math	4th grade	Video	Relate place value to standard algorithm for multi-digit addition	http://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-adding-carrying/v/adding-multi-digit-numbers-with-place-value
Math	4th grade	Video	Relate place value to standard algorithm for multi-digit subtraction	http://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-regrouping-3-dig/v/understanding-place-value-when-subtracting
Math	4th grade	Video	Multi-digit subtraction: 389,002-76,151	http://www.khanacademy.org/math/arithmetic/arith-review-add-subtract/arith-review-regrouping-3-dig/v/subtracting-multi-digit-numbers-with-regrouping
Math	4th grade	Video	Convert liters to milliliters	http://www.khanacademy.org/math/cc-fourth-grade-math/cc-4th-measurement-topic/cc-4th-convert-volume/v/liters-to-milliliters-examples
Math	AP Calculus AB	Article	Submit your questions about the 2018 AP Calculus AB exam	http://www.khanacademy.org/math/ap-calculus-ab/prepare-for-the-2018-ap-calculus-ab-exam/prepare-for-the-exam-calc-ab-2018/a/submit-your-questions-about-the-2018-ap-calculus-ab-exam
Math	AP Calculus BC	Article	Submit you questions about the 2018 AP Calculus BC exam	http://www.khanacademy.org/math/ap-calculus-bc/prepare-for-the-2018-ap-calculus-bc-exam/prepare-for-the-exam/a/submit-you-questions-about-the-2018-ap-calculus-bc-exam
Math	AP Statistics	Exercise	Expected counts in a goodness-of-fit test	http://www.khanacademy.org/math/ap-statistics/chi-square-tests/chi-square-goodness-fit/e/expected-counts-chi-square-goodness-of-fit-test
Math	AP Statistics	Exercise	Conditions for a goodness-of-fit test	http://www.khanacademy.org/math/ap-statistics/chi-square-tests/chi-square-goodness-fit/e/checking-conditions-chi-square-goodness-of-fit-test
Math	AP Statistics	Exercise	Test statistic and P-value in a goodness-of-fit test	http://www.khanacademy.org/math/ap-statistics/chi-square-tests/chi-square-goodness-fit/e/test-statistic-p-value-chi-square-goodness-of-fit-test
Math	AP Statistics	Exercise	Conclusions in a goodness-of-fit test	http://www.khanacademy.org/math/ap-statistics/chi-square-tests/chi-square-goodness-fit/e/conclusions-chi-square-goodness-of-fit-test
Math	AP Statistics	Exercise	Conditions for inference on two means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-interval-means/e/conditions-two-sample-t-interval-difference-means
Math	AP Statistics	Exercise	Two-sample t interval for the difference of means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-interval-means/e/calculating-two-sample-t-interval-difference-means
Math	AP Statistics	Video	Constructing t interval for difference of means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-interval-means/v/constructing-t-interval-for-difference-of-means
Math	AP Statistics	Video	Calculating confidence interval for difference of means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-interval-means/v/calculating-confidence-interval-for-difference-of-means
Math	AP Statistics	Video	Conditions for inference for difference of means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-interval-means/v/conditions-for-inference-for-difference-of-means
Math	AP Statistics	Exercise	Conditions for inference on two proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-interval-proportions/e/conditions-two-sample-z-interval-difference-proportions
Math	AP Statistics	Exercise	Two-sample z interval for the difference of proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-interval-proportions/e/calculating-two-sample-z-interval--difference-proportions
Math	AP Statistics	Video	Calculating a confidence interval for the difference of proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-interval-proportions/v/calculating-two-sample-z-interval-confidence-interval-for-difference-of-proportions
Math	AP Statistics	Video	Examples identifying conditions for inference on two proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-interval-proportions/v/examples-identifying-conditions-for-two-sample-z-tests-and-z-intervals
Math	AP Statistics	Video	Confidence intervals for the difference between two proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-interval-proportions/v/confidence-intervals-for-the-difference-between-two-proportions
Math	AP Statistics	Exercise	P-value in a two-sample t test	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/e/p-value-in-a-two-sample-t-test-for-the-difference-of-means
Math	AP Statistics	Exercise	Writing hypotheses to test the difference of means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/e/hypotheses-two-sample-t-test-means
Math	AP Statistics	Exercise	Test statistic in a two-sample t test	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/e/test-statistic-p-value-two-sample-t-test-means
Math	AP Statistics	Exercise	Making conclusions about the difference of means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/e/conclusions-two-sample-t-test-means
Math	AP Statistics	Video	Hypotheses for a two-sample t test	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/v/alternative-hypothesis-for-2-sample-t-test
Math	AP Statistics	Video	Example of hypotheses for paired and two-sample t tests	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/v/example-of-hypotheses-for-paired-and-2-sample-t-tests
Math	AP Statistics	Video	Conclusion for a two-sample t test using a confidence interval	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/v/conclusion-for-2-sample-t-test-from-confidence-interval
Math	AP Statistics	Video	Conclusion for a two-sample t test using a P-value	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/v/conclusion-for-2-sample-t-test-from-p-value
Math	AP Statistics	Video	Two-sample t test for difference of means	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-t-test-means/v/two-sample-t-test-for-difference-of-means
Math	AP Statistics	Exercise	P-value in a two-sample z test for the difference of proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/e/p-value-difference-proportions
Math	AP Statistics	Exercise	Writing hypotheses for testing the difference of proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/e/hypotheses-two-sample-z-test-proportions
Math	AP Statistics	Exercise	Test statistic in a two-sample z test for the difference of proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/e/test-statistic-p-value-two-sample-z-test-proportions
Math	AP Statistics	Video	Confidence interval for hypothesis test for difference in proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/v/confidence-interval-for-hypothesis-test-for-difference-in-proportions
Math	AP Statistics	Video	Constructing hypotheses for two proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/v/constructing-hypotheses-for-two-proportions
Math	AP Statistics	Video	Comparing P value to significance level for test involving difference of proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/v/p-value-conclusions-difference-proportions
Math	AP Statistics	Video	Hypothesis test for difference in proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/v/hypothesis-test-for-difference-in-proportions
Math	AP Statistics	Video	Hypothesis test for difference in proportions example	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/v/hypothesis-test-for-difference-in-proportions-example
Math	AP Statistics	Exercise	Making conclusions about the difference of proportions	http://www.khanacademy.org/math/ap-statistics/two-sample-inference/two-sample-z-test-proportions/e/conclusions-two-sample-z-test-proportions
Math	AP Statistics	Article	Submit your questions about the 2018 AP Statistics exam	http://www.khanacademy.org/math/ap-statistics/prepare-for-the-2018-ap-statistics-exam/prepare-for-ap-stats-exam/a/submit-your-questions-about-the-2018-ap-statistics-exam
Math	AP Statistics	Video	Significance test for a proportion free response (part 2 with correction)	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/v/full-significance-test-example-from-ap-test-part-2-with-correction
Math	AP Statistics	Video	Significance test for a proportion free response example	http://www.khanacademy.org/math/ap-statistics/tests-significance-ap/one-sample-z-test-proportion/v/full-significance-test-example-from-ap-test
Science	AP Physics 1	Exercise	Forces at an angle	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/angled-forces-ap/e/forces-at-an-angle-ap1
Science	AP Physics 1	Article	Angled forces review	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/angled-forces-ap/a/angled-forces-ap1
Science	AP Physics 1	Exercise	Static and kinetic friction	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/friction-ap/e/friction-ap1
Science	AP Physics 1	Article	Friction review	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/friction-ap/a/friction-ap-physics-1
Science	AP Physics 1	Exercise	Forces and inclined planes	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/inclined-planes-ap/e/inclined-planes-ap1
Science	AP Physics 1	Article	Inclined planes review	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/inclined-planes-ap/a/inclined-planes-ap1
Science	AP Physics 1	Exercise	Introduction to free body diagrams	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/introduction-to-forces-and-free-body-diagrams-ap/e/free-body-diagrams-ap-physics-1
Science	AP Physics 1	Article	Introduction to forces and free body diagrams review	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/introduction-to-forces-and-free-body-diagrams-ap/a/forces-introduction-and-free-body-diagrams-ap1
Science	AP Physics 1	Exercise	Net force and acceleration exercise	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/newtons-first-law-mass-and-inertia-ap/e/newtons-first-law-exercises-ap1
Science	AP Physics 1	Article	Newton's first law review	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/newtons-first-law-mass-and-inertia-ap/a/newtons-first-law-review
Science	AP Physics 1	Exercise	Newton's second law: Solving for force, mass, and acceleration	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/newtons-second-law-ap/e/newton-s-second-law
Science	AP Physics 1	Article	Newton's second law review	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/newtons-second-law-ap/a/newtons-second-law
Science	AP Physics 1	Exercise	Identifying equal and opposite forces	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/newtons-third-law-ap/e/newton-s-third-law
Science	AP Physics 1	Article	Newton's third law review	http://www.khanacademy.org/science/ap-physics-1/ap-forces-newtons-laws/newtons-third-law-ap/a/newtons-third-law-ap1
Science	AP Physics 1	Exercise	Calculating average acceleration from graphs	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-and-instantaneous-acceleration/e/acceleration-numerical-exercises-ap1
Science	AP Physics 1	Exercise	Connecting acceleration and velocity graphs	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-and-instantaneous-acceleration/e/acceleration-exercises-ap1
Science	AP Physics 1	Article	Acceleration review	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-and-instantaneous-acceleration/a/acceleration-review-article-ap1
Science	AP Physics 1	Exercise	Average velocity and speed in one direction: word problems	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-velocity-and-speed/e/practice--velocity---speed--without-graphs-
Science	AP Physics 1	Exercise	Average velocity and speed with direction changes: word problems	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-velocity-and-speed/e/average-velocity---speed-multi-motion--no-graph-
Science	AP Physics 1	Video	Average velocity and speed worked example	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-velocity-and-speed/v/average-velocity-and-speed-worked-example
Science	AP Physics 1	Article	Average velocity and speed review	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/average-velocity-and-speed/a/review-article-velocity-speed-no-graphs
Science	AP Physics 1	Exercise	Finding distance and displacement from graphs	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/distance-displacement-and-coordinate-systems/e/yj-physics-exercise-1
Science	AP Physics 1	Article	Distance and displacement review	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/distance-displacement-and-coordinate-systems/a/relative-motion-review-article
Science	AP Physics 1	Article	Motion with constant acceleration review	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/motion-with-constant-acceleration/a/1d-kinematics-review-article
Science	AP Physics 1	Exercise	Freefall: graphs and conceptual questions	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/falling-objects-ap-physics/e/freefall-exercise-ap1-graphs-and-concepts
Science	AP Physics 1	Exercise	Solving freefall problems using kinematic formulas	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/falling-objects-ap-physics/e/freefall-exercises-ap1-numerical
Science	AP Physics 1	Article	Freefall review	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/falling-objects-ap-physics/a/freefall-ap1
Science	AP Physics 1	Exercise	Finding displacement from velocity graphs	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/instantaneous-velocity-and-speed/e/v-t-area-displacement
Science	AP Physics 1	Article	Instantaneous velocity and speed from graphs review	http://www.khanacademy.org/science/ap-physics-1/ap-one-dimensional-motion/instantaneous-velocity-and-speed/a/average-velocity-speed-w-graphs
Science	AP Physics 1	Article	What's the 2018 Physics 1 exam format?	http://www.khanacademy.org/science/ap-physics-1/prepare-for-the-ap-physics-1-exam/prepare-for-the-ap-physics-1-exams/a/whats-the-2018-physics-1-exam-format
Science	AP Physics 1	Article	AP Free response tips	http://www.khanacademy.org/science/ap-physics-1/prepare-for-the-ap-physics-1-exam/prepare-for-the-ap-physics-1-exams/a/ap-free-response-tips-physics1
Science	AP Physics 1	Article	How to practice with our multiple choice questions	http://www.khanacademy.org/science/ap-physics-1/prepare-for-the-ap-physics-1-exam/prepare-for-the-ap-physics-1-exams/a/how-to-practice-with-our-multiple-choice-questions-physics1
Science	AP Physics 1	Article	Submit your questions about the 2018 AP Physics 1 exam	http://www.khanacademy.org/science/ap-physics-1/prepare-for-the-ap-physics-1-exam/prepare-for-the-ap-physics-1-exams/a/submit-your-questions-about-the-2018-ap-physics-1-exam
Science	AP Physics 1	Exercise	Adding and decomposing vectors using trigonometry	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/analyzing-vectors-using-trigonometry-ap/e/analyzing-vectors-in-2d-ap1
Science	AP Physics 1	Article	Analyzing vectors using trigonometry review	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/analyzing-vectors-using-trigonometry-ap/a/2d-kinematics-vectors-analytical-ap1
Science	AP Physics 1	Video	Projectile motion graphs	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/graphs-of-projectile-motion-ap/v/projectile-motion-graphs
Science	AP Physics 1	Article	Projectile motion graphs review	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/graphs-of-projectile-motion-ap/a/projectile-motion-graphs-in-2d
Science	AP Physics 1	Exercise	Solving kinematic equations for horizontal projectiles	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/horizontally-launched-projectiles-ap/e/2d-projectile-motion-with-components-given-exercise
Science	AP Physics 1	Article	Horizontally launched projectile review	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/horizontally-launched-projectiles-ap/a/projectile-kinematics-in-2d
Science	AP Physics 1	Exercise	Describing two-dimensional motion with vectors	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/introduction-to-vectors-and-two-dimensional-motion-ap/e/intro-to-2d-kinematics-ap1
Science	AP Physics 1	Article	Introduction to two-dimensional motion review	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/introduction-to-vectors-and-two-dimensional-motion-ap/a/intro-to-2d-kinematics-ap1-review-article
Science	AP Physics 1	Exercise	Angled launch projectile vectors	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/projectiles-launched-at-an-angle-ap/e/angled-launch-projectile-vectors-exercise
Science	AP Physics 1	Exercise	Comparing projectile trajectories	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/projectiles-launched-at-an-angle-ap/e/comparing-projectile-trajectories
Science	AP Physics 1	Article	Projectiles launched at an angle review	http://www.khanacademy.org/science/ap-physics-1/ap-two-dimensional-motion/projectiles-launched-at-an-angle-ap/a/projectiles-launched-at-angles
Science	High school biology	Video	Introduction to lipids	http://www.khanacademy.org/science/high-school-biology/hs-biology-foundations/hs-biological-macromolecules/v/introduction-to-lipids
Science	High school biology	Video	Introduction to nucleic acids and nucleotides	http://www.khanacademy.org/science/high-school-biology/hs-biology-foundations/hs-biological-macromolecules/v/introduction-to-nucleic-acids-and-nucleotides
Science	High school biology	Video	Introduction to proteins and amino acids	http://www.khanacademy.org/science/high-school-biology/hs-biology-foundations/hs-biological-macromolecules/v/introduction-to-proteins-and-amino-acids
Science	High school biology	Video	Introduction to carbohydrates	http://www.khanacademy.org/science/high-school-biology/hs-biology-foundations/hs-biological-macromolecules/v/introduction-to-carbohydrates
Science	High school biology	Exercise	Introduction to heredity	http://www.khanacademy.org/science/high-school-biology/hs-classical-genetics/hs-introduction-to-heredity/e/hs-introduction-to-heredity
Science	High school biology	Article	Introduction to heredity review	http://www.khanacademy.org/science/high-school-biology/hs-classical-genetics/hs-introduction-to-heredity/a/hs-introduction-to-heredity-review
Science	High school biology	Article	Non-Mendelian inheritance review	http://www.khanacademy.org/science/high-school-biology/hs-classical-genetics/hs-non-mendelian-inheritance/a/hs-non-mendelian-inheritance-review
Science	High school biology	Exercise	Non-Mendelian inheritance	http://www.khanacademy.org/science/high-school-biology/hs-classical-genetics/hs-non-mendelian-inheritance/e/hs-non-mendelian-inheritance
Science	High school biology	Article	Pedigrees	http://www.khanacademy.org/science/high-school-biology/hs-classical-genetics/hs-pedigrees/a/hs-pedigrees
Science	High school biology	Exercise	The digestive and excretory systems	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-digestive-and-excretory-systems/e/hs-the-digestive-and-excretory-systems
Science	High school biology	Article	The digestive and excretory systems review	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-digestive-and-excretory-systems/a/hs-the-digestive-and-excretory-systems-review
Science	High school biology	Exercise	The immune system	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-immune-system/e/hs-the-immune-system
Science	High school biology	Article	The immune system review	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-immune-system/a/hs-the-immune-system-review
Science	High school biology	Article	The musculoskeletal system review	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-musculoskeletal-system/a/hs-the-musculoskeletal-system-review
Science	High school biology	Exercise	The nervous and endocrine systems	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-nervous-and-endocrine-systems/e/hs-the-nervous-and-endocrine-systems
Science	High school biology	Article	The nervous and endocrine systems review	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-nervous-and-endocrine-systems/a/hs-the-nervous-and-endocrine-systems-review
Science	High school biology	Exercise	The reproductive system	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-reproductive-system/e/hs-the-reproductive-system
Science	High school biology	Article	The reproductive system review	http://www.khanacademy.org/science/high-school-biology/hs-human-body-systems/hs-the-reproductive-system/a/hs-the-reproductive-system-review
Science	High school biology	Video	Impact of mutations on translation into amino acids	http://www.khanacademy.org/science/high-school-biology/hs-molecular-genetics/hs-dna-replication-and-protein-synthesis/v/impact-of-mutations-on-translation-into-amino-acids

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