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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.


