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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.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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 longest a person has survived after a heart transplant is 24 years.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.