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Everyone has one nostril that is larger than the other.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
Many supplement containers do not even contain what their labels say. There are many documented reports of products containing much less, or more, that what is listed on their labels. They may also contain undisclosed prescription drugs and even contaminants.
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
![Ice-wedges form netlike polygons on the surface of the tundra, aerial photo of polygonal peat platea](https://biology-forums.com/gallery/47/medium_33_27_08_11_11_56_24_15472357.jpeg)
![Variation in the rate of evolution as a function of the strength of selection, assuming genetic drif](https://biology-forums.com/gallery/47/medium_33_31_08_11_2_12_19_16211335.jpeg)