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Did you know?
The human body produces and destroys 15 million blood cells every second.
Did you know?
Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
Did you know?
According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
Did you know?
There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
Did you know?
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
![Alexander Fleming photographed in his lab where he observed the natural competition between a fungus](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_20_13_100452376.jpeg)
![At breakfast, a middle-class husband sits absorbed in the newspaper and the public affairs of the da](https://biology-forums.com/gallery/47/medium_6_24_08_15_12_36_52_224132038.jpeg)