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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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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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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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There are approximately 3 million unintended pregnancies in the United States each year.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.