Wanted: A Science of UFOs | Alexander Wendt | TEDxColumbus
17:51
UFOs and Aliens – What Science Says | Donald Prothero | TEDxResedaBlvd
17:30
Why We are Alone in the Galaxy | Marc Defant | TEDxUSF
18:37
Master Shi Heng Yi – 5 hindrances to self-mastery | Shi Heng YI | TEDxVitosha
17:42
A Theory You've Never Heard Of | Michael Robinson | TEDxUniversityofHartford
11:23
Why we should search for alien artifacts | Beatriz Villarroel | TEDxZurich
15:01
Have you ever imagined how interstellar travel could work? | Ryan Weed | TEDxDanubia
14:59
I've studied nuclear war for 35 years -- you should be worried. | Brian Toon | TEDxMileHigh
12:27