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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.
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A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
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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.