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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
The toxic levels for lithium carbonate are close to the therapeutic levels. Signs of toxicity include fine hand tremor, polyuria, mild thirst, nausea, general discomfort, diarrhea, vomiting, drowsiness, muscular weakness, lack of coordination, ataxia, giddiness, tinnitus, and blurred vision.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.