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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 familiar sounds of your heart are made by the heart's valves as they open and close.

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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

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Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%

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