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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
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.
Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.