KEEPING UP WITH KHAN

Don't miss the top things to learn on Khan Academy this week: Is it better to rent or buy a home? Sal explains the math of renting vs. buying a home, challenging the notion that it is always better to buy. Learn now What secret math sequence keeps popping up in nature? "Recreational Mathemusician" Vi Hart uncovers the mysteries of spirals, Fibonacci, and being a plant. Learn now Make your own robot from easy-to-find parts! Discover that anyone from 3rd grade and up can build their very own thinking robot. Learn now Recently added by Crash Course: Water = liquid awesome! Hank teaches us why water is one of the most fascinating and important substances in the universe. Learn now Learn something new at Khan Academy