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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

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