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Did you know?
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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.