On this day in 1974, scientists at the Arecibo Observatory in Puerto Rico sent the first message intended for alien lifeforms.
This Day in History Class
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Gasoline rationing begins in the United States - May 15th, 1942
A white mob attacks a group of Freedom Riders - May 14th, 1961
The Socialist Party of America nominates a convict for president - May 13th, 1920