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Did you know?
Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
Did you know?
There are more nerve cells in one human brain than there are stars in the Milky Way.
Did you know?
More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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![The number of words correctly completed in the New York Times crossword puzzle increases with age ...](https://biology-forums.com/gallery/27/medium_660366_07_04_17_9_55_37_2748151.jpeg)