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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.