TED-Ed
Úr Ásta
http://tedchris.posterous.com/
Why Can't We See Evidence of Alien Life? http://youtu.be/I2apGYUX7Q0
How Many Universes are There? http://youtu.be/a1bWKZFP2Tc
http://tedchris.posterous.com/
Why Can't We See Evidence of Alien Life? http://youtu.be/I2apGYUX7Q0
How Many Universes are There? http://youtu.be/a1bWKZFP2Tc