The World on a String by Brian Greene
© Brian R. Greene 2004 [1]
In 1919, Einstein received a paper that could easily have been dismissed as the ravings of a crank. It was written by a little-known German mathematician named Theodor Kaluza, and in a few brief pages it laid out an approach for unifying the two forces known at the time, gravity and electromagnetism.
to be continued
[1] Source: Chapter 12: The Fabric of the Cosmos (Allen Lane, London, 2004, ISBN 978-0-141-03529-1).
