Content Update: April 2019 (Putting the AP in APril 😄)

Over the last weeks we've announced big updates to our courses on AP US History, AP Computer Science Principles, AP Microeconomics, and AP Biology, and you can see the results of so many peoples' hard work in the April content update below. As always, stay tuned for even more coming in May, but do give yourself a moment to bask in the glory of all the beautiful new items this month...

Domain	Subject	Title	Content kind	URL
(No domain)	Resources	Video tour: Khan Academy AP Computer Science Principles	Video	http://www.khanacademy.org/resources/teacher-essentials/teaching-computing/v/khan-academy-ap-computer-science-principles-a-tour-for-teachers
Arts and humanities	Ancient Mediterranean	Holding on to pagan traditions in the early Christian era: The Symmachi Panel	Video	http://www.khanacademy.org/humanities/ancient-art-civilizations/roman/late-empire/v/holding-on-to-pagan-traditions-in-the-early-christian-era-the-symmachi-panel
Arts and humanities	AP US History	Articles of Confederation	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/articles-of-confederation-ush-lesson/e/apush-articles-of-confederation-exercise
Arts and humanities	AP US History	Constitution	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/apush-constitution/e/apush-constitution-exercise
Arts and humanities	AP US History	Developing an American identity	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/developing-an-american-identity/e/apush-developing-an-american-identity-exercise
Arts and humanities	AP US History	Movement in the early republic	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/movement-in-the-early-republic/e/apush-movement-in-the-early-republic-exercise
Arts and humanities	AP US History	Philosophical foundations of the American Revolution	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/philosophical-foundations-of-the-american-revolution/e/apush-philosophical-foundations-of-the-american-revolution-exercise
Arts and humanities	AP US History	Shaping a new republic	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/apush-shaping-a-new-republic/e/apush-shaping-a-new-republic-exercise
Arts and humanities	AP US History	Social consequences of revolutionary ideals	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/social-consequences-of-revolutionary-ideals-lesson/e/apush-social-consequences-of-revolutionary-ideals-exercise
Arts and humanities	AP US History	Taxation without representation	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/taxation-without-representation/e/apush-taxation-without-representation-exercise
Arts and humanities	AP US History	The American Revolution	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/apush-the-american-revolution/e/apush-the-american-revolution-exercise
Arts and humanities	AP US History	The Constitutional Convention and debates over ratification	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-3/apush-the-constitutional-convention-and-debates-over-ratification/e/apush-the-constitutional-convention-and-debates-over-ratification-exercise
Arts and humanities	AP US History	African Americans in the early republic	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-african-americans-in-the-early-republic-lesson/e/african-americans-in-the-early-republic
Arts and humanities	AP US History	America on the world stage	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/aush-america-on-the-world-stage-lesson/e/america-on-the-world-stage
Arts and humanities	AP US History	An age of reform	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-an-age-of-reform-lesson/e/an-age-of-reform
Arts and humanities	AP US History	Expanding democracy	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-expanding-democracy-lesson/e/expanding-democracy
Arts and humanities	AP US History	Jackson and federal power	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-jackson-and-federal-power-lesson/e/jackson-and-federal-power
Arts and humanities	AP US History	Market Revolution: industrialization	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-market-revolution-industrialization-lesson/e/market-revolution--industrialization
Arts and humanities	AP US History	Market Revolution: society and culture	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-market-revolution-society-and-culture-lesson/e/market-revolution--society-and-culture
Arts and humanities	AP US History	Politics and regional interests	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-politics-and-regional-interests-lesson/e/politics-and-regional-interests
Arts and humanities	AP US History	Second Great Awakening	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-second-great-awakening-lesson/e/second-great-awakening
Arts and humanities	AP US History	The development of an American culture	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-the-development-of-an-american-culture-lesson/e/the-development-of-an-american-culture
Arts and humanities	AP US History	The rise of political parties and the era of Jefferson	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-the-rise-of-political-parties-and-the-era-of-jefferson-lesson/e/the-rise-of-political-parties-and-the-era-of-jefferson
Arts and humanities	AP US History	The society of the South in the early republic	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-4/apush-the-society-of-the-south-in-the-early-republic-lesson/e/the-society-of-the-south-in-the-early-republic
Arts and humanities	AP US History	1920s: cultural and political controversies	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-1920s-cultural-and-political-controversies-lesson/e/1920s--cultural-and-political-controversies
Arts and humanities	AP US History	1920s: innovations in communication and technology	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-1920s-innovations-in-communication-and-technology-lesson/e/1920s--innovations-in-communication-and-technology
Arts and humanities	AP US History	Imperialism: debates	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-imperialism-debates-lesson/e/imperialism--debates
Arts and humanities	AP US History	Interwar foreign policy	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-interwar-foreign-policy-lesson/e/interwar-foreign-policy
Arts and humanities	AP US History	Postwar diplomacy	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/postwar-diplomacy/e/postwar-diplomacy
Arts and humanities	AP US History	Spanish-American War	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-spanish-american-war-lesson/e/spanish-american-war
Arts and humanities	AP US History	Great Depression	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-great-depression/e/great-depression
Arts and humanities	AP US History	The New Deal	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-the-new-deal-lesson/e/the-new-deal
Arts and humanities	AP US History	The Progressives	Exercise	https://www.khanacademy.org/humanities/ap-us-history/period-7/apush-the-progressives-lesson/e/the-progressives
Arts and humanities	AP US History	World War I: Homefront	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-world-war-i-homefront-lesson/e/world-war-i--homefront
Arts and humanities	AP US History	World War I: military & diplomacy	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-world-war-i-military-and-diplomacy-lesson/e/world-war-i--military---diplomacy
Arts and humanities	AP US History	World War II: military	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-us-wwii-military-lesson/e/world-war-ii--military
Arts and humanities	AP US History	World War II: mobilization	Exercise	http://www.khanacademy.org/humanities/ap-us-history/period-7/apush-world-war-ii-mobilization-lesson/e/world-war-ii--mobilization
Arts and humanities	Art history basics	Describing what you see: Sculpture (Henry Moore, Reclining Figure)	Video	http://www.khanacademy.org/humanities/art-history-basics/tools-understanding-art/v/describing-sculpture-henry-moore
Arts and humanities	Art in 19th century Europe	Sleeping Beauty ‚Äî but without the Kiss: Burne-Jones and the Briar Rose series	Video	http://www.khanacademy.org/humanities/becoming-modern/victorian-art-architecture/pre-raphaelites/v/burne-jones-briar-rose
Arts and humanities	Art of the Americas to World War I	Blythe, Justice	Video	http://www.khanacademy.org/humanities/art-americas/us-art-19c/realism-us/v/blythe-justice-reposted-with-minor-correction
Arts and humanities	Europe 1300-1600	Persian carpets, a peacock, and a cucumber, understanding Crivelli's Annunciation	Video	http://www.khanacademy.org/humanities/renaissance-reformation/early-renaissance1/painting-in-florence/v/crivelli-annunciation
Arts and humanities	Europe 1300-1600	Aldo Manuzio (Aldus Manutius): inventor of the modern book	Article	http://www.khanacademy.org/humanities/renaissance-reformation/early-renaissance1/venice-early-ren/a/aldo-manuzio-aldus-manutius-inventor-of-the-modern-book
Arts and humanities	Modernisms 1900-1980	Barbara Hepworth, Pelagos	Video	http://www.khanacademy.org/humanities/art-1010/art-post-war-britain/v/barbara-hepworth-pelagos
Computing	AP Computer Science Principles	Expressing an algorithm	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/building-algorithms/e/expressing-an-algorithm
Computing	AP Computer Science Principles	Expressing an algorithm	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/building-algorithms/a/expressing-an-algorithm
Computing	AP Computer Science Principles	The building blocks of algorithms	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/building-algorithms/a/the-building-blocks-of-algorithms
Computing	AP Computer Science Principles	The building blocks of algorithms	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/building-algorithms/e/the-building-blocks-of-algorithms
Computing	AP Computer Science Principles	Verifying an algorithm	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/evaluating-algorithms/a/verifying-an-algorithm
Computing	AP Computer Science Principles	Measuring an algorithm's efficiency	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/evaluating-algorithms/e/measuring-algorithm-efficiency
Computing	AP Computer Science Principles	Measuring an algorithm's efficiency	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/evaluating-algorithms/a/measuring-an-algorithms-efficiency
Computing	AP Computer Science Principles	Categorizing run time efficiency	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/evaluating-algorithms/e/comparing-run-time-efficiencies
Computing	AP Computer Science Principles	Categorizing run time efficiency	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/evaluating-algorithms/a/comparing-run-time-efficiency
Computing	AP Computer Science Principles	Verifying an algorithm	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/evaluating-algorithms/e/verifying-an-algorithm
Computing	AP Computer Science Principles	Using heuristics	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/solving-hard-problems/a/using-heuristics
Computing	AP Computer Science Principles	Solving hard problems	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/solving-hard-problems/e/using-heuristics
Computing	AP Computer Science Principles	Undecidable problems	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/algorithms-101/solving-hard-problems/a/undecidable-problems
Computing	AP Computer Science Principles	What are the parts of a computer?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/computer--components/a/computer-components-overview
Computing	AP Computer Science Principles	Input & output devices	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/computer--components/a/computer-input-devices
Computing	AP Computer Science Principles	Central Processing Unit (CPU)	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/computer--components/a/central-processing-unit-cpu
Computing	AP Computer Science Principles	Computer memory	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/computer--components/a/computer-memory
Computing	AP Computer Science Principles	Secondary memory	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/computer--components/a/computer-secondary-memory
Computing	AP Computer Science Principles	Computer components	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/computer--components/e/input--cpu--memory--and-output
Computing	AP Computer Science Principles	What is a computer file?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-lesson-cpu-memory-and-storage/a/files-introduction
Computing	AP Computer Science Principles	File types	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-lesson-cpu-memory-and-storage/a/file-types-kinds-extensions
Computing	AP Computer Science Principles	File sizes	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-lesson-cpu-memory-and-storage/a/file-storage-sizes-and-types
Computing	AP Computer Science Principles	Files and sizes	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-lesson-cpu-memory-and-storage/e/file-storage--sizes--and-types
Computing	AP Computer Science Principles	How do computers represent data?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-digital-data-rep/a/digital-data-overview
Computing	AP Computer Science Principles	From electricity to bits	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-digital-data-rep/e/from-wires-to-bits
Computing	AP Computer Science Principles	From electricity to bits	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-digital-data-rep/a/how-do-computers-represent-data
Computing	AP Computer Science Principles	Binary numbers	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-digital-data-rep/a/bits-and-binary
Computing	AP Computer Science Principles	How can computers reduce file size?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/file-compression/a/file-compression
Computing	AP Computer Science Principles	Simple image compression	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/file-compression/a/simple-image-compression
Computing	AP Computer Science Principles	File compression	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/file-compression/e/lossless-file-compression
Computing	AP Computer Science Principles	Lossy vs. Lossless compression	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/file-compression/a/lossy-vs-lossless-compression
Computing	AP Computer Science Principles	Lossy vs. Lossless compression	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/file-compression/e/lossy-vs-lossless-compression
Computing	AP Computer Science Principles	Logic gates	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-staging/a/logic-gates
Computing	AP Computer Science Principles	Logic circuits	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/computers-101/ap-cs-p-staging/a/circuits
Computing	AP Computer Science Principles	The era of big data	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/big-data/a/what-is-big-data
Computing	AP Computer Science Principles	The sources of big data	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/big-data/a/sources-of-big-data
Computing	AP Computer Science Principles	The power of big data	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/big-data/a/the-power-of-big-data
Computing	AP Computer Science Principles	Big data	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/big-data/e/analyzing-large-data-sets
Computing	AP Computer Science Principles	Computing basic statistics	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/data-tools/e/exploring-data-sets
Computing	AP Computer Science Principles	Finding patterns in data sets	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/data-tools/a/finding-patterns-in-data-sets
Computing	AP Computer Science Principles	Finding patterns in data sets	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/data-tools/e/finding-patterns-in-data-sets
Computing	AP Computer Science Principles	Computing basic statistics	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/data-tools/a/learning-from-data-sets
Computing	AP Computer Science Principles	Storing data sets	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/data-analysis-101/data-tools/a/storing-data-sets
Computing	AP Computer Science Principles	Khan Academy practice system	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/ap-csp-exam-preparation/prepare-for-the-2019-ap-cs-p-exam/a/khan-academy-practice-system-guide
Computing	AP Computer Science Principles	AP CSP exam overview	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/ap-csp-exam-preparation/prepare-for-the-2019-ap-cs-p-exam/a/ap-cs-p-exam-format
Computing	AP Computer Science Principles	AP CSP vocabulary review	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/ap-csp-exam-preparation/prepare-for-the-2019-ap-cs-p-exam/a/vocabulary-review
Computing	AP Computer Science Principles	Random numbers	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/e/random-numbers
Computing	AP Computer Science Principles	Nested conditionals	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/a/nested-conditionals
Computing	AP Computer Science Principles	Nested conditionals	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/e/nested-conditionals
Computing	AP Computer Science Principles	Random numbers	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/a/generating-random-numbers
Computing	AP Computer Science Principles	Conditionals with if, else, and Booleans	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/e/conditionals-with-if--else--and-booleans
Computing	AP Computer Science Principles	Compound Booleans with logical operators	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/a/compound-booleans-with-logical-operators
Computing	AP Computer Science Principles	Compound Booleans with logical operators	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/e/compound-booleans-with-logical-operators
Computing	AP Computer Science Principles	Conditionals with if, else, and Booleans	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/boolean-logic/a/conditionals-with-if-else-and-booleans
Computing	AP Computer Science Principles	Iterating over lists with loops	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/lists/e/iterating-over-lists-with-loops
Computing	AP Computer Science Principles	Iterating over lists with loops	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/lists/a/iterating-over-lists-with-loops
Computing	AP Computer Science Principles	Storing and updating lists	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/lists/a/storing-lists-of-data
Computing	AP Computer Science Principles	Storing and updating lists	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/lists/e/storing-and-updating-lists
Computing	AP Computer Science Principles	Mathematical procedures and constants	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/numbers-and-math/a/mathematical-procedures-and-constants
Computing	AP Computer Science Principles	Mathematical expressions	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/numbers-and-math/e/programming-mathematical-expressions
Computing	AP Computer Science Principles	Mathematical procedures and constants	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/numbers-and-math/e/mathematical-procedures-and-constants
Computing	AP Computer Science Principles	Number limits, overflow, and round-off	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/numbers-and-math/e/number-limits--overflow--and-round-off
Computing	AP Computer Science Principles	Mathematical expressions	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/numbers-and-math/a/programming-mathematical-expressions
Computing	AP Computer Science Principles	Defining a procedure	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/procedures/a/making-your-own-procedures
Computing	AP Computer Science Principles	Procedures with parameters	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/procedures/a/procedures-with-parameters
Computing	AP Computer Science Principles	Procedures with return values	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/procedures/a/procedures-with-return-values
Computing	AP Computer Science Principles	Procedures with parameters	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/procedures/e/procedures-with-parameters
Computing	AP Computer Science Principles	Defining a procedure	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/procedures/e/making-procedures
Computing	AP Computer Science Principles	Procedures with return values	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/procedures/e/procedures-with-return-values
Computing	AP Computer Science Principles	Numbered repetition of instructions	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/repetition-with-loops/a/repetition-with-for-loops
Computing	AP Computer Science Principles	Conditional repetition of instructions	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/repetition-with-loops/a/conditional-repetition-of-instructions
Computing	AP Computer Science Principles	Conditional repetition of instructions	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/repetition-with-loops/e/conditional-repetition-of-instructions
Computing	AP Computer Science Principles	Numbered repetition of instructions	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/repetition-with-loops/e/repeating-code-multiple-times
Computing	AP Computer Science Principles	Storing strings in variables	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/strings/a/storing-strings-in-variables
Computing	AP Computer Science Principles	String operations	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/strings/a/string-concatenation
Computing	AP Computer Science Principles	String operations	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/strings/e/string-operations
Computing	AP Computer Science Principles	Storing strings in variables	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/strings/e/string-variables
Computing	AP Computer Science Principles	Storing data in variables	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/storing-variables/e/variable-assignment
Computing	AP Computer Science Principles	Storing data in variables	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/storing-variables/a/assigning-variables
Computing	AP Computer Science Principles	Our first program	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/what-is-programming/a/our-first-program-hello-world
Computing	AP Computer Science Principles	Understanding pseudocode	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/what-is-programming/a/understanding-pseudocode
Computing	AP Computer Science Principles	Programming basics	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/programming-101/what-is-programming/e/programming-basics
Computing	AP Computer Science Principles	How does cyber crime happen?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/cybercrime-and-prevention/a/how-does-cyber-crime-happen
Computing	AP Computer Science Principles	Computer malware and attacks	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/cybercrime-and-prevention/e/computer-malware-and-attacks
Computing	AP Computer Science Principles	Phishing and password attacks	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/cybercrime-and-prevention/a/phishing-and-passwords
Computing	AP Computer Science Principles	Phishing and password attacks	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/cybercrime-and-prevention/e/phishing-and-password-attacks
Computing	AP Computer Science Principles	Privacy on the web	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/http-html/e/privacy-on-the-web
Computing	AP Computer Science Principles	HTTP Secure (HTTPS)	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/http-html/e/http-secure--https-
Computing	AP Computer Science Principles	What is the world wide web?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/http-html/a/introducing-the-world-wide-web
Computing	AP Computer Science Principles	HyperText Transfer Protocol (HTTP)	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/http-html/a/hypertext-transfer-protocol-http
Computing	AP Computer Science Principles	HTTP Secure (HTTPS)	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/http-html/a/http-secure-https
Computing	AP Computer Science Principles	Privacy on the web	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/http-html/a/privacy-on-the-web
Computing	AP Computer Science Principles	How do computers find each other?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/ip-dns-scalable-internet-addressing/a/network-addressing-with-ip-dns
Computing	AP Computer Science Principles	IP addresses	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/ip-dns-scalable-internet-addressing/a/ip-addresses
Computing	AP Computer Science Principles	Domain name system (DNS)	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/ip-dns-scalable-internet-addressing/a/domain-name-system-dns
Computing	AP Computer Science Principles	IP addresses	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/ip-dns-scalable-internet-addressing/e/network-addressing-with-ip---dns
Computing	AP Computer Science Principles	How can computers send data reliably?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tcp-fault-tolerant-transmission-protocol/a/how-can-computers-send-data-reliably
Computing	AP Computer Science Principles	Internet routing protocol	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tcp-fault-tolerant-transmission-protocol/a/internet-routing-protocol
Computing	AP Computer Science Principles	Internet routing protocol	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tcp-fault-tolerant-transmission-protocol/e/internet-routing-protocol
Computing	AP Computer Science Principles	Transmission Control Protocol (TCP)	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tcp-fault-tolerant-transmission-protocol/a/transmission-control-protocol-tcp
Computing	AP Computer Science Principles	Transmission Control Protocol (TCP)	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tcp-fault-tolerant-transmission-protocol/e/transmission-control-protocol--tcp-
Computing	AP Computer Science Principles	How can computers send private data?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tls-secure-data-transport/a/how-can-we-securely-send-data
Computing	AP Computer Science Principles	Public key encryption	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tls-secure-data-transport/a/public-key-encryption
Computing	AP Computer Science Principles	Public key encryption	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tls-secure-data-transport/e/public-key-encryption
Computing	AP Computer Science Principles	Transport Layer Security (TLS)	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tls-secure-data-transport/a/transport-layer-security-tls
Computing	AP Computer Science Principles	Transport Layer Security (TLS)	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tls-secure-data-transport/e/transport-layer-security--tls-
Computing	AP Computer Science Principles	Encryption, decryption, and cracking	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tls-secure-data-transport/a/encryption-decryption-and-code-cracking
Computing	AP Computer Science Principles	Symmetric encryption techniques	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/tls-secure-data-transport/a/symmetric-encryption-techniques
Computing	AP Computer Science Principles	How can we physically connect two computers?	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/wires-wifi-physical-network-connections/a/how-can-we-physically-connect-two-computers
Computing	AP Computer Science Principles	Transporting bits over wires	Article	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/wires-wifi-physical-network-connections/a/transporting-bits-over-wires
Computing	AP Computer Science Principles	Transporting bits over wires	Exercise	http://www.khanacademy.org/computing/ap-computer-science-principles/the-internet/wires-wifi-physical-network-connections/e/transporting-bits-over-wires

Domain	Subject	Title	Content kind	URL
Economics and finance	AP Microeconomics	Shifts in the demand for labor	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/ap-labor-marginal-product-rev/v/shifts-in-demand-for-labor
Economics and finance	AP Microeconomics	Changes in labor supply	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/ap-labor-marginal-product-rev/v/changes-in-labor-supply
Economics and finance	AP Microeconomics	Changes in factor demand and supply	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/ap-labor-marginal-product-rev/e/changes-in-factor-demand-and-supply
Economics and finance	AP Microeconomics	Introduction to labor markets	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/introduction-to-factor-markets/v/introduction-to-labor-markets
Economics and finance	AP Microeconomics	Introduction to Factor Markets	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/introduction-to-factor-markets/e/introduction-to-factor-markets
Economics and finance	AP Microeconomics	A monopsonistic market for labor	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/monopsonistic-markets/v/a-monopsonistic-market-for-labor
Economics and finance	AP Microeconomics	Monopsony employers and minimum wages	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/monopsonistic-markets/v/monopsony-employers-and-minimum-wages
Economics and finance	AP Microeconomics	Monopsonistic Markets	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/monopsonistic-markets/e/monopsonistic-markets
Economics and finance	AP Microeconomics	Cost minimizing choice of inputs	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/profit-maximizing-behavior-in-perfectly-competitive-factor-markets/v/cost-minimizing-choice-of-inputs
Economics and finance	AP Microeconomics	Factor markets worked example	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/profit-maximizing-behavior-in-perfectly-competitive-factor-markets/v/factor-markets-worked-example-microeconomics-khan-academy
Economics and finance	AP Microeconomics	Profit-maximizing behavior in perfectly competitive factor markets	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/factor-markets/profit-maximizing-behavior-in-perfectly-competitive-factor-markets/e/profit-maximizing-behavior-in-perfectly-competitive-factor-markets
Economics and finance	AP Microeconomics	Imperfect competition	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/introduction-to-imperfect-competition/e/imperfect-competition
Economics and finance	AP Microeconomics	Long term economic profit for monopolistic competition	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/monopolistic-competition/v/long-term-economic-profit-for-monopolistic-competition
Economics and finance	AP Microeconomics	Monopolistic competition	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/monopolistic-competition/e/monopolistic-competition
Economics and finance	AP Microeconomics	Monopolies vs. perfect competition	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/ap-monopolies-tutorial/v/monopolies-vs-perfect-competition
Economics and finance	AP Microeconomics	Economic profit for a monopoly	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/ap-monopolies-tutorial/v/economic-profit-for-a-monopoly
Economics and finance	AP Microeconomics	Monopoly	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/ap-monopolies-tutorial/e/monopoly
Economics and finance	AP Microeconomics	Natural monopoly	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/ap-monopolies-tutorial/e/natural-monopoly
Economics and finance	AP Microeconomics	Game theory worked example from AP Microeconomics	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/oligopoly-and-game-theory/v/game-theory-worked-example-from-a-p-microeconomics
Economics and finance	AP Microeconomics	Oligopoly and game theory: foundational concepts	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/oligopoly-and-game-theory/e/oligopoly-and-game-theory--foundational-concepts
Economics and finance	AP Microeconomics	Game Theory	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/oligopoly-and-game-theory/e/game-theory
Economics and finance	AP Microeconomics	Price discrimination for a monopoly	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/ap-price-discrimination-tutorial/v/price-descrimination-for-a-monopoly
Economics and finance	AP Microeconomics	Price discrimination	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/imperfect-competition/ap-price-discrimination-tutorial/e/price-discrimination
Economics and finance	AP Microeconomics	Externalities	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/externalities/e/externalities
Economics and finance	AP Microeconomics	Inequality	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/inequality/e/inequality
Economics and finance	AP Microeconomics	Gini Coefficient and Lorenz Curve	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/inequality/v/gini-coefficient-and-lorenz-curve
Economics and finance	AP Microeconomics	Public and private goods	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/public-and-private-goods/e/public-and-private-goods
Economics and finance	AP Microeconomics	Rival and excludable goods	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/public-and-private-goods/v/rival-and-excludable-goods
Economics and finance	AP Microeconomics	Socially efficient and inefficient outcomes	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/socially-efficient-and-inefficient-market-outcomes/v/socially-efficient-and-inefficient-outcomes
Economics and finance	AP Microeconomics	Socially efficient and inefficient market outcomes	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/socially-efficient-and-inefficient-market-outcomes/e/socially-efficient-and-inefficient-market-outcomes
Economics and finance	AP Microeconomics	The effects of government intervention in different market structures	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/ap-consumer-producer-surplus/the-effects-of-government-intervention-in-different-market-structures/e/the-effects-of-government-intervention-in-different-market-structures
Economics and finance	AP Microeconomics	Firms' Short-Run Decisions to Produce and Long-Run Decisions to Enter or Exit a Market	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/36/e/firms-short-run-decisions-to-produce-and-long-run-decisions-to-enter-or-exit-a-market
Economics and finance	AP Microeconomics	Long-run production costs	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/33-long-run-p/e/long-run-production-costs
Economics and finance	AP Microeconomics	Economic profit for firms in perfectly competitive markets	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/v/economic-profit-for-firms-in-perfectly-competitive-markets
Economics and finance	AP Microeconomics	Long run supply when industry costs aren't constant	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/v/long-run-supply-when-industry-costs-are-increasing-or-decreasing
Economics and finance	AP Microeconomics	Long-run economic profit for perfectly competitive firms	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/v/long-run-economic-profit-for-perfectly-competitive-firms
Economics and finance	AP Microeconomics	Long-run supply curve in constant cost perfectly competitive markets	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/v/long-run-supply-curve-in-constant-cost-perfectly-competitive-markets
Economics and finance	AP Microeconomics	Free response question (FRQ) on perfect competition	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/v/frq-microecononomics-on-perfect-competition
Economics and finance	AP Microeconomics	Introduction to perfect competition	Video	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/v/perfect-competition-microeconomics
Economics and finance	AP Microeconomics	Perfect competition foundational concepts	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/e/3-7-a-perfect-competition-foundations
Economics and finance	AP Microeconomics	Perfect competition in the short run and long run	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/e/perfect-competition-in-the-short-run-and-long-run
Economics and finance	AP Microeconomics	Increasing, decreasing, and constant cost industries	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/e/increasing--decreasing--and-constant-cost-industries
Economics and finance	AP Microeconomics	Efficiency and perfect competition	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/ap-perfect-competition/e/efficiency-and-perfect-competition
Economics and finance	AP Microeconomics	Short-run production costs: foundational concepts	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/short-run-production-costs/e/short-run-production-costs--foundational-concepts
Economics and finance	AP Microeconomics	Short-run production costs	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/short-run-production-costs/e/short-run-production-costs
Economics and finance	AP Microeconomics	The production function	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/the-production-function/e/3-1-the-production-function
Economics and finance	AP Microeconomics	Types of profit	Exercise	http://www.khanacademy.org/economics-finance-domain/ap-microeconomics/production-cost-and-the-perfect-competition-model-temporary/types-of-profit/e/types-of-profit
Science	AP Biology	Cell communication	Exercise	http://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-communication/e/cell-communication-exercise
Science	AP Biology	Cell cycle	Exercise	http://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/cell-cycle/e/cell-cycle-exercise
Science	AP Biology	Changes in signal transduction pathways	Exercise	http://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/changes-in-signal-transduction-pathways/e/changes-in-signal-transduction-pathways-exercise
Science	AP Biology	Feedback	Exercise	http://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/feedback/e/feedback-exercise
Science	AP Biology	Regulation of cell cycle	Exercise	http://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/regulation-of-cell-cycle/e/regulation-of-cell-cycle-exercise
Science	AP Biology	Signal transduction	Exercise	http://www.khanacademy.org/science/ap-biology/cell-communication-and-cell-cycle/signal-transduction/e/signal-transduction-exercise
Science	AP Biology	Per capita population growth and exponential growth	Video	http://www.khanacademy.org/science/ap-biology/ecology-ap/population-ecology-ap/v/per-capita-population-growth-and-exponential-growth
Science	AP Biology	Translation	Exercise	http://www.khanacademy.org/science/ap-biology/gene-expression-and-regulation/translation/e/translation-exercise
Science	AP Biology	Meiosis and genetic diversity	Exercise	http://www.khanacademy.org/science/ap-biology/heredity/meiosis-and-genetic-diversity/e/meiosis-and-genetic-diversity-exercise
Science	AP Biology	Mendelian genetics	Exercise	http://www.khanacademy.org/science/ap-biology/heredity/mendelian-genetics-ap/e/mendelian-genetics-exercise

Content Update: April 2019 (Putting the AP in APril 😄)

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