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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Excessive alcohol use costs the country approximately $235 billion every year.