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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
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The longest a person has survived after a heart transplant is 24 years.
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Your heart beats over 36 million times a year.