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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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.