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Thyroid conditions may make getting pregnant impossible.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.