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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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There are more bacteria in your mouth than there are people in the world.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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The average adult has about 21 square feet of skin.
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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.