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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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.