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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.