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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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.
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Thyroid conditions may make getting pregnant impossible.