|
|
There are 20 feet of blood vessels in each square inch of human skin.
Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Illicit drug use costs the United States approximately $181 billion every year.
Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.
![A DOHC engine uses a camshaft for the intake valve and a separate camshaft for the exhaust valves in ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_1_02_48_293232417.png)
![A schematic of a typical glow plug circuit. Notice that the relay for the glow plug and intake air ...](https://biology-forums.com/gallery/29/medium_548020_25_05_17_1_22_50_29343451.png)