An astronaut's theory of how dinosaurs flew. | Don Pettit | TEDxNaperville
20:10
The Unusual Earth Orbit Circling Above Our Ancient Past | Roger G. Gilbertson | TEDxColoradoSprings
12:17
The tyranny of the rocket equation | Don Pettit | TEDxHouston 2013
19:33
The Roots of Religion: Genevieve Von Petzinger at TEDxVictoria
16:42
Why the Moon | Don Pettit | TEDxNaperville
20:29
Why I changed my mind about nuclear power | Michael Shellenberger | TEDxBerlin
17:05
The Origins and Evolution of Language | Michael Corballis | TEDxAuckland
12:10
Building Vertical Cities: Daniel Winey at TEDxConnecticutCollege
15:51