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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.
People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
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.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.