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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.

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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).

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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