There are more sensory neurons in the tongue than in any other part of the body.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Thyroid conditions may make getting pregnant impossible.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
Amiens Cathedral.
Flying buttresses, Cathedral of Notre-Dame, Paris.
Santa Costanza, Rome.
Central portal of the west facade, Reims Cathedral, France.