Squirrel monkeys and male baboons will gesture with an erect penis as a threat to predators or as a sign of impending danger.

Alexandre Gustave Eiffel, the man who designed the Eiffel Tower, also designed the inner structure of the Statue of Liberty in New York Harbour.

The smallest stamp in the world was issued in 1863 by the Columbian state of Bolivar and measured 9.5 x 8mm.

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