On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.
Life-cycle of the Sun; sizes are not drawn to scale