About This Video

Physicist Brian Greene explains how Albert Einstein, wrestling with how exactly gravity works, originally formulated the general theory of relativity. The landmark breakthrough provided the first unified description of gravity as a geometric property of space and time. It also laid the foundation for understanding more bizarre properties of the universe—like the curvature of spacetime, string theory, and the possibility of multiple, hidden dimensions of the universe.

Recorded June 2010; Posted October 2010