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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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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.