Is Our Universe The Only Universe?

Is there more than one universe? Physicist Brian Greene shows how the unanswered questions of physics have led to the theory that our own universe is just one of many in the "multiverse."

Source: http://www.npr.org/2013/08/02/172322740/is-our-universe-the-only-universe?ft=1&f=1007

Candle Making Canoeing Car Racing Casino Gambling Cave Diving