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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Your heart beats over 36 million times a year.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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.