After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
