Thank you SO MUCH Khan Academy for ALL THE wonderful, informative posts you have shared with us!! I am so sad that your MCAT content will no longer be available after 30 September 2020, but I just wanted to let you all know how grateful I am to have this! It has been an invaluable resource for years and I learned/learn so much just watching your videos rather than lectures or reading a textbook. Knowledge is priceless and you've all greatly contributed to my learning/success! Watching Sal's videos always gave me more appreciation for the content I was learning...Learning is so much fun watching these videos. Having someone who is truly passionate about what he does, teaching you the subjects is the best. I wish you all the best and please stay safe! Thank you so much again!!