Thyroid conditions may make getting pregnant impossible.
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The average adult has about 21 square feet of skin.
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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
Human immunodeficiency virus (HIV)
Human eye anatomy
Glands in human body
Modern Human Fossil Sites in the Old World
Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee.