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Everyone has one nostril that is larger than the other.
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.
Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
A recent study has found that following a diet rich in berries may slow down the aging process of the brain. This diet apparently helps to keep dopamine levels much higher than are seen in normal individuals who do not eat berries as a regular part of their diet as they enter their later years.
![Connecting a handheld digital storage oscilloscope to an oxygen sensor signal wire. The use of the ...](https://biology-forums.com/gallery/29/medium_548020_30_05_17_10_29_36_299481229.png)
![A schematic representation of the convergence of cones and rods on retinal ganglion cells. There is ...](https://biology-forums.com/gallery/30/medium_548020_05_06_17_11_21_54_3029189.png)