Stephen Hawking's Grand Design - Season 1: Episode 2

"The Key to the Cosmos," poses the ultimate-of-ultimate questions: Why does the universe exist and why does it follow rules and laws? What's the point of the enormous, endless cosmos, and why is it so perfectly tuned so as to allow life to exist? From Newton's ground breaking discovery of gravity, through hidden extra dimensions, to a muti-verse of billions more universes where anything - and everything - is possible.