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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.