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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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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 horizontal fraction bar was introduced by the Arabs.
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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.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.