![](http://www.alamy.com/thumbs/6/C2AAC367-9EE5-4B30-B9CA-8595E5B9E4A6/2AJXR0F.jpg)
Vintage photo of theoretical physicist Albert Einstein (1879 – 1955) giving a speech at the Eighth American Scientific Congress in Washington DC in May 1940. Photo by Harris & Ewing.
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Photo credit: © Archive Pics / Alamy / Afripics
License: Licensed
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