Heart attack explained in 10 easy minutes

by Carolyn Thomas 

Once you visit Sal Khan‘s website, you’ll abandon Heart Sisters as well as all other sites you love, and may never come back. His Khan Academy is the thinking person’s version of those addictive cute kitty time-wasters on YouTube.   

It all started a few years ago when the brainy and engaging young Sal was asked to help out his 6th grade cousin Nadia with her math.

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