Vaccines prevent between 2.5 and 4 million deaths every year.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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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.
Many Natural Resources Can Be Sustained
When a Tornado Strikes: Social Organization Following a Natural Disaster