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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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.