<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>Yes, your people are adapted to live in the Arctic. My ancestors are mostly from Scandinavia, and so I carry some adaptations, particularly my fair skin -- the better to produce Vitamin D in the weaker sunlight at higher latitudes. The negative side-effect is, of course, my tendency to sunburn easily. But I think your people are better adapted to the Arctic than my people, so I think your ancestors have probably been at high latitudes longer than mine. Random factoid about marine mammals: their blubber is a rich source of Vitamin C, which is why even in ancient times, native peoples of the far north did not get scurvy (vitamin C deficiency which causes a breakdown of connective tissues and, eventually, death; was a major problem for European sailors until someone figured out that eating citrus fruit cured it). The San, like most Africans, are indeed dark-skinned, an adaptation which reduces the damage they get from the sun. (Dark skin has arisen in many low-latitude groups, from Africa to Polynesia to New Guinea and Australia.) The San are different from most blacks, however. Their skin is more golden than most people's, for one thing. They are also shorter and more lightly built, the better to survive in the marginal conditions of the desert, and they can go longer without water than most other humans, being able to store more water in their body tissues. One of their more obvious differences doesn't seem to be adapative; some differences are just random, after all. Their hair does not grow continuously. Most humans have hair that will grow to at least three feet in length before being shed. The San do not. Theirs stays very short. It also grows in small whorls all over the head. Since no other humans have this trait, they must have been genetically isolated for a very long time.Other interesting groups of humans (genetically speaking) include the Pygmies, a group who may be related to the San, although they live in the rainforest rather than the desert. Pygmies reach sexual maturity much younger than any other human (8 is not uncommon) and are much smaller in size. They are traditionally migrant hunter-gatherers, though they are increasingly starting to settle down in villages as their habitat shrinks away. One interesting factoid: despite their relatively primitive lifestyle, their medical practices are fairly advanced, and they have a particular focus on dental hygeine.Many residents of Nepal and Tibet, particularly Sherpas, are adapted to high altitude. Their blood has a prodigious oxygen-transport capability unmatched in any other ethnic group (though some native South American groups, residing in the Altiplano and the Andes, come close). Sherpa mountain guides are known to conduct mountain run contests to see who can get to the peak of Mount Everest and back the fastest.Non-San Africans carry a gene which makes them more resistant to malaria. (It does not make them immune, but makes them more likely to survive an infestation.) A side-effect of this gene is that if it is carried on both sides, it causes sickle cell anemia, a non-fatal but excruciating condition. As our species globalizes, many of these adaptations will mingle. It will be interesting for future generations to see how our species changes as traits which previously were not shared have a chance to mix and match. <br /> Posted by CalliArcale</DIV></p><p>There might be some pros and cons to mingle, I mean in relation to our health and well being. Like the sickle-cell anemia, being introduced to another region, if and when the decendants decide to move with their mom and dad, or whether the decendants need to arrange for custody or something like that, because when we're humans, we love our parents and sometimes things don't always go as planned. </p><p> CalliArcale, I can't help it when I see your little saying about time. I think time is more like cycles if we don't look at it in a linear perspective. Indeed, time is a cycle. </p> <div class="Discussion_UserSignature"> We always walked on water, like skating! </div>