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There are 20 feet of blood vessels in each square inch of human skin.
Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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.
All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
![Gallbladder with gallstones. Note the stones in the hepatic duct, gallbladder, and common bile duct.](https://biology-forums.com/gallery/47/medium_14755_30_09_12_4_40_41_91531880.jpeg)
![An intermediate shaft drives the oil pump on this overhead camshaft engine. Note the main gallery ...](https://biology-forums.com/gallery/29/medium_548020_30_05_17_2_34_13_29609181.png)