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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").