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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.
Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.