David Christian's TED2011 Talk
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David Christian weaves together a story that helps explain how the universe gradually built greater and greater complexity and reveals what makes humans special. Learn more at the Big History Project.
Read previous versions of the Annual Letter
Personalized learning is shaking up the classroom and letting students go at their own pace.
My thought-provoking discussion with a Teacher of the Year.
How two innovative universities are helping more first-generation, low-income students get college degrees.
My video tribute to scientist Richard Feynman.
Looking back at 2013, I wanted to share a different kind of list.
This is my personal blog, where I share about the people I meet, the books I'm reading, and what I'm learning. I hope that you'll join the conversation.
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