Ryan Coogler, director of "Creed" and "Fruitvale Station," picks his 6 favorite talks.
Ron Finley
A guerrilla gardener in South Central LA
Elizabeth Gilbert
Your elusive creative genius
Allan Savory
How to fight desertification and reverse climate change
Graham Hill
Less stuff, more happiness
Peter Singer
The why and how of effective altruism
Elon Musk
The mind behind Tesla, SpaceX, SolarCity ...
