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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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.
Blood is approximately twice as thick as water because of the cells and other components found in it.