Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.