In order for you to remember what you’ve learned, you need context and repetition . Trying to memorize an isolated equation 2 weeks after you learned it is way too difficult. 21st Night is built to use context and repetition to make what you learn stick in your head.
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Jeff Bezos tells a great story about the smartest guy he knew at Princeton. He and a classmate were working on a really tough partial differential equation and getting nowhere. They spent 3 hours on the problem and gave up.