Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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Each king in a deck of playing cards represents a great king from history: spades - King David, clubs - Alexander the Great, hearts - Charlemagne, and diamonds - Julius Caesar.
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Clocks made before 1660 had only one hand - an hour hand.
41
The last time American Green cards were actually green was 1964.
60
Harry S. Truman was the last U.S. President with no college degree.
55
In the great fire of London, in 1666, half of London was burnt down but only 6 people were injured.
78