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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
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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.