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There are more sensory neurons in the tongue than in any other part of the body.
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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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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").