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Did you know?
Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
Did you know?
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
Did you know?
More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
Did you know?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Did you know?
Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.
![A killer whale plays with a ball of ice, soon after a researcher had thrown a snowball at the whale.](https://biology-forums.com/gallery/47/medium_27599_22_04_12_6_57_45.jpeg)
![Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f](https://biology-forums.com/gallery/47/medium_6_31_05_15_8_20_42_21974458.jpeg)