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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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There are more bacteria in your mouth than there are people in the world.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).