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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The average adult has about 21 square feet of skin.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.