General relativity is the cornerstone of cosmology and astrophysics. It has also provided the conceptual basis for string theory and other attempts to unify all the forces of nature in terms of geometrical structures.
“I started off as a juggler. I used to do a half-hour show on the weekends to make money as a kid. Then I went to Cleveland, Ohio in 1983 to the international jugglers competition junior division and came second. So that was my first job, being a juggler.”