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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.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.