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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.