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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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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.