Unifying the fundamental forces under one theory has been the great quest of physics.

A letter written by Albert Einstein in which he writes out his famous E=mc2 equation has sold at auction for more than $1.2 million.

David Norman reviews The Physics of Birds and Birding: the Sounds, Colors and Movements of Birds, and Our Tools for Watching Them by Michael Hurben ...

Handwritten example of famous Einstein equation gets $1.2M A letter written by Albert Einstein in which he writes out his famous E=mc2 equation has sold at auction for more than $1.2 million ...