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There are more bacteria in your mouth than there are people in the world.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.
![Varicella or chickenpox, a viral skin infection. In this photograph, the rash is beginning to form s](https://biology-forums.com/gallery/47/medium_14755_16_09_12_6_01_25_87781652.jpeg)
![Use friction to mobilize the entire scalp. Place the fingers on the scalp, and move the skin over ...](https://biology-forums.com/gallery/33/medium_380798_23_08_17_3_13_07_331401026.jpeg)