Nazi leader Adolf Hitler had only one testicle.
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February 1865 is the only month in recorded history to not have a full moon.
83
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.
22
Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
153
Canada's new flag, with its maple leaf design, was unfurled in 1965 in Ottawa!
22
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.
33
Leonardo da Vinci could write with one hand and draw with the other at the same time.
56