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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.