David Christian: The history of our world in 18 minutes
David Byrne: How architecture helped music evolve
Roger Ebert: Remaking my voice
Kwame Anthony Appiah: Is religion good or bad? (This is a trick question)
Rory Bremner: A one-man world summit
Nora Atkinson: Why art thrives at Burning Man
Craft curator Nora Atkinson takes us on a trip to Nevada's Black Rock Desert to see the beautifully designed and participatory art of Burning Man, revealing how she discovered there what's often missing from museums: curiosity and engagement. "What is art for in our contemporary world if not this?" she asks.
Benjamin Barber: Why mayors should rule the world
It often seems like federal-level politicians care more about creating gridlock than solving the world's problems. So who's actually getting bold things done? City mayors. So, political theorist Benjamin Barber suggests: Let's give them more control over global policy. Barber shows how these "urban homeboys" are solving pressing problems on thei...
Jonathan Haidt: The moral roots of liberals and conservatives