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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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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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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.
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Blood is approximately twice as thick as water because of the cells and other components found in it.