Why are blue whales so enormous? - Asha de Vos
How art gives shape to cultural change - Thelma Golden
The danger of science denial - Michael Specter
High-altitude wind energy from kites! - Saul Griffith
How to restore a rainforest - Willie Smits
How Benjamin Button got his face - Ed Ulbrich
The El Sistema music revolution - Jose Antonio Abreu
Toy tiles that talk to each other - David Merrill
Mosquitos, malaria and education - Bill Gates
Why I'm a weekday vegetarian - Graham Hill
Toward a science of simplicity - George Whitesides
What adults can learn from kids - Adora Svitak