Michio Kaku's Civilizations of the Cosmos
03/11/2013 18:47
"What does it mean for a civilization to be a million years old? We have had radio telescopes and spaceships for a few decades; our technical civilization is a few hundred years old ... an advanced civilization millions of years old is as much beyond us as we are beyond a bushbaby or a macaque." Carl Sagan. [Read more] ...