The tyranny of the rocket equation | Don Pettit | TEDxHouston 2013
17:30
Why We are Alone in the Galaxy | Marc Defant | TEDxUSF
16:42
Why the Moon | Don Pettit | TEDxNaperville
12:38
The Real Reason to be Afraid of Artificial Intelligence | Peter Haas | TEDxDirigo
17:59
What if Everything You Know is Wrong: Bob McDonald at TEDxVictoria 2013
16:16
An astronaut's theory of how dinosaurs flew. | Don Pettit | TEDxNaperville
17:33
Why renewables can’t save the planet | Michael Shellenberger | TEDxDanubia
15:01
¿Te imaginas como sería un viaje interestelar? | Ryan Weed | TEDxDanubia
13:40