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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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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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The average adult has about 21 square feet of skin.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.