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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.