The first documented blood transfusion took place using sheep blood in a teenage boy.
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College students illegally produced America's first X-ray photo.
The Philadelphia Zoo opened. At the time, it was the only zoo in the 'New World.'
Kangaroo fossil research showed that they may have learned to hop over 20 million years ago.
The Pyrenean ibex went extinct after the last surviving member of the species was killed by a falling branch.
The Soviet Union sent a dog into space aboard the spacecraft Sputnik II.
