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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.

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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.

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