Leonardo da Vinci’s “The Last Supper” was returned to display in Milan after 22 years of restoration.
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Alan Turing submitted his paper 'On Computable Numbers' for publication, in which he set out the hypothetical basis for modern computers.
The second black regiment (54 Mass) left Boston to fight in US Civil War.
Joan of Arc was accused of reverting into heresy by donning male clothing again.
NASA tested the Saturn I launch vehicle with a boilerplate Apollo spacecraft for the first time.
The Sierra Club was formed.
