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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 lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.