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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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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 longest a person has survived after a heart transplant is 24 years.