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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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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.