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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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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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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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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.