Stephen Hawking's Mystery

Today is Stephen Hawking's 70th birthday. He was diagnosed with debilitating ALS (Lou Gehrig's disease) when he was 21 years old, but has defied all odds to go on to become one of the most prominent physicists and cosmologists of our time.

Guess what he said recently when asked about what puzzles him most!
DDarkness's Avatar
Jack,

You continue to AMAZE me!!! That was great!

DD