These things are good at getting me to want to read the book...

"My mind immediately pictured all the half-assed videos I had made for my cousins -- where my son is screaming in the background or I'm trying to cram in a concept before my wife comes home from work. Did Bill Gates really watch those?

After about a week, Gates' chief of staff called. He told me that Bill would like to fly me to Seattle to meet and see how he could support the Khan Academy. I was staring at my calendar as he was asking my availability; it was completely blank for the next month. Sitting in my closet and trying to sound as cool as possible, I said, "Sure, I think I could squeeze something in."

I love this line: "The software I wrote for my cousins had become so popular it was making my $50-a-month web host crash."