According to the accepted theory of evolution, a trait has to be "selected" in order to become a permanent characteristic of a species. In other words, it has to be a trait that makes the owner of that trait more likely to pass their genes on. In our current society, hairlessness is widely regarded to be unattractive; a person with a full head of hair is more likely to find a mating partner and pass their genes on than somebody who has no hair. Therefore, that trait isn't likely to become prominent in our species.

Most likely not. Humans, at this point, have already gotten rid of just about all the hair we ever will, and the reason we still retain some is that it serves a purpose. Eyebrows serve as a guard for your eyes, collecting dust before it has a chance to fall into your eye. Hair on your head serves as insulation, seeing as there is little between your skull and the outside air... and it's needless to say, an important area to keep the blood flowing. Facial hair is primarily for attracting mates. Even if a woman today does not find a beard attractive, it was at one time considered manly, brute, and sexy. Cultures have varied when it comes to facial hair... the Egyptians and Arabs grew long, narrow beards from their chin. the Romans adopted the practice of clean shaving (the word "Barbarian" comes from Rome, with 'barbar' meaning beard... Barbarian meaning bearded one). The Germanic and Nordic people grew their beards as long as possible. The one constant is that every culture seems to have made facial hair into a fashion of some sorts... and that is perhaps the best reason it has stuck around. However, if humans ever do lose any more hair, it will likely be the first to go. Underarm and pubic hair is a lubrication between your arms and legs rubbing against your body when you move, preventing chaffing. This is why humans (who walk upright) have underarm hair whereas most dogs do not. At one time, this hair was considered a sign of fertility... if a woman was hairy, she was of the ripe age to produce young. However, in America, it's more often than not considered unattractive for a woman (and men, too, sometimes) to have underarm hair, thus they often shave it. Trimmed and/or shaved pubic hair is also usually considered the ideal by Americans. But just because we find it unattractive doesn't mean it's going to dissapear from our genes anytime soon... it serves too much of a purpose and humans are about as naked as an ape is ever going to be.

Short of a catastrophe which sends us back to the stoneage, it's unlikely that humans will continue to evolve naturally. We are already manipulating the human gene pool by prenatal screening, screening out genetic problems that we don't want our children to have. In the future humans will no doubt have the technology to directly engineer our own bodies, both before birth and after birth. Evolution takes thousands of years to bring about physical change, but future medical techniques will only take months.

Your answer actually lies in the reason we lost hair. Just because we lose some hair, it does not mean we will lose more. "More is better" as a rule only. We lost hair to accommodate the latest breakthrough evolution made to cool creatures. The human has the latest cooling system evolution installed, But the sweating need a surface to evaporate from, and close hair impeded it. A slight amount of hair helps it. A man in good shape could travel in the open sun and heat for a while all animals have to take to the shade.

Evolution may not cause humans to become completely hairless, but the process of Natural Selection may possibly head us in that direction. Natural Selection (as defined by Wikipedia) is: "the process by which individual organisms with favorable traits are more likely to survive and reproduce than those with unfavorable traits. Natural selection works on the whole individual, but only the heritable component of a trait will be passed on to the offspring, with the result that favorable, heritable traits become more common in the next generation. Given enough time, this passive process can result in adaptations and speciation." Given this definition, it is possible for any desirable trait, whether cosmetic or otherwise, to become dominant in a species. This includes things like body shape, hair color, amount of hair, and even foot size. I would suggest that overall body hair is a less than desirable feature, and would expect that our species will move away from this selection over time. Head hair on the other hand is a rather subjective feature, and I don't expect that the desire for a mate with a full head of hair is likely to go the way of the desire for back hair.

I've always wondered why some races are less hairless than others. Asians for instance.

Hey no one gave point for a good question. so there ya go! +4