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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).