21 November in history.

1905

Einstein's paper leads to E = mc². The journal Annalen der Physik printed a paper by Albert Einstein that led to the famous equation E = mc².

Wikipedia: Albert Einstein

Photo: Oren Jack Turner / Wikimedia Commons (Public domain)

More from 21 November

1. 1676

   Ole Rømer measures the speed of light

   Danish astronomer Ole Rømer presented the first measurements that put a number on the speed of light.

   Wikipedia: AstronomerWikipedia: Ole RømerWikipedia: Rømer's determination of the speed of light

2. 

   1877

   Edison announces the phonograph

   Thomas Edison told the world about his phonograph, a machine that could record sound and play it back.

   Wikipedia: Thomas EdisonWikipedia: Phonograph

   Photo: Louis Bachrach, Bachrach Studios , restored by Michel Vuijlsteke / Wikimedia Commons (Public domain)

3. 

   1922

   Rebecca Felton becomes the first woman senator

   Rebecca Latimer Felton took her seat as the first woman in the United States Senate, even though she served for just one day.

   Wikipedia: Rebecca Latimer FeltonWikipedia: United States Senate

   Photo: National Photo Company Collection. / Wikimedia Commons (Public domain)

4. 

   1964

   The Verrazzano-Narrows Bridge opens

   Traffic began crossing the Verrazzano-Narrows Bridge between Staten Island and Brooklyn. At the time, it was the longest suspension bridge on Earth.

   Wikipedia: Verrazzano–Narrows BridgeWikipedia: Staten IslandWikipedia: Brooklyn

   Photo: H.L.I.T. / Wikimedia Commons (Public domain)

Moments chosen for discovery, creativity and courage. Each one links to a source where you can read more; photos are credited to their owners.