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The average adult has about 21 square feet of skin.
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There are approximately 3 million unintended pregnancies in the United States each 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.
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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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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.