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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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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.