|
|
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.
Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
![Field research on free-living primates allows primatologists to study patterns of behavior in the se](https://biology-forums.com/gallery/47/medium_269691_26_01_15_5_55_23_204322151.jpeg)
![Organizational Effects of Testosterone Around the time of birth, testosterone masculinizes and defem](https://biology-forums.com/gallery/47/medium_339612_26_04_15_11_00_45_21512783.jpeg)