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There are 20 feet of blood vessels in each square inch of human skin.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.