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September 26, 2018
March 6, 2017
September 20, 2015
October 27, 2008
April 6, 2008
April 3, 2008
found an excellent reference
+113
it's like the story of the boiled frog - better known as an example than a real phenomenon
+189
another source
+100
quote from →Smithsonian Magazine
-415