There are more bacteria in your mouth than there are people in the world.
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Thyroid conditions may make getting pregnant impossible.
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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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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
Examination of the interior of the eye using an ophthalmoscope.
The Moon’s Interior
Interior, Pantheon, Rome.
Corbel Vault, Interior of Tholos, The So-called Treasury of Atreus