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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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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are more sensory neurons in the tongue than in any other part of the body.
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There are approximately 3 million unintended pregnancies in the United States each year.