Stephen Hawking · every age

What was Stephen Hawking doing at 29?

Given two years to live at 21, he worked for 55 more

1. c. 1971

   Showed that a black hole's surface can never shrink

   The area theorem, one of the laws of black hole mechanics.

   Source: en.wikipedia.org

Portrait: Photo: NASA (StarChild), public domain, via Wikimedia Commons · source