DNA Day (April 25th)
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D
Daria
DNA Day is a holiday celebrated on April 25. It commemorates the day in 1953 when James Watson, Francis Crick, Maurice Wilkins, Rosalind Franklin and colleagues published papers in the journal Nature on the structure of DNA. The stamp should of course have a DNA helix on it
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Shiro from Slowly
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Discovery of DNA ( April 25 )
Nonethewiser
I like this idea and I think it could make a nice stamp. Here's the Wiki link: