Some of us learn best in the classroom, and some of us ... well, we don't. But we still love to learn -- we just need to find the way that works for us. In this charming, personal talk, author John Green shares the community of learning...

This video looks at the mind-bending world of Hilbert's Hotel, a thought experiment by the mathematician David Hilbert. We discover how a hotel with an infinite number of rooms can always make space for more guests—even when it’s already...

What happens at infinity? - The Cantor set