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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.

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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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There are approximately 3 million unintended pregnancies in the United States each year.

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