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."
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There are more sensory neurons in the tongue than in any other part of the body.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Children of people with alcoholism are more inclined to drink alcohol or use hard drugs. In fact, they are 400 times more likely to use hard drugs than those who do not have a family history of alcohol addiction.
The endocrine control of spermatogenesis.
Hypothyroidism. Hyposecretion of the thyroid gland produces the symptoms that are illustrated.