> Pj wrote: "Why did evolve into hairless mammals just to skin other mammals to use their fur to keep warm."
We are the last of the savannah apes. The African savannah was very warm when our ancestors lived there. We adapted by losing most of our fur and gaining many more sweat glands. Even today we can run down and kill antelope simply by jogging after them till they overheat.
> Pj wrote: "By growing more intelligent there was still no logical reason for modern man to lose the strength of our alleged ancestors."
Strength comes at the cost of dexterity. Watch a chimp try to throw a rock or a spear sometime. They are very bad at it. Bulky muscles also interfere with distance-running and temperature regulation on the hot savannah. Bulky muscles also require more food to maintain.
> Pj wrote: "If evolution took place over billions of years there is in fact no reasoning to growth of the human species intelligence over the last few thousand years."
It's been the last few million years, not the last few thousand. And the reason our brains grew bigger than any previous species is that big brains are costly, and only certain circumstances cause them to be adaptive. Our ape ancestors left the forests and jungles and started trying to live in the savannahs. The advantages they brought to the new environment were fairly high intelligence, dextrous hands, and (presumably) very basic tool use such as chimps have now. Those were the characteristics that natural selection honed, and together they complimented each other and allowed our ancesters to survive. Something like a lion or a gopher, on coming to the savannah, would have other advantages for natural selection to work with. Very large brains wouldn't be particularly helpful for lions or gophers, because the benefits wouldn't balance the drawbacks. Drawbacks include very long childhood dependencies, increased food requirements, increased helplessness of infants, and increased pain and risk of death from childbirth. Only the ability to make better and better tools makes all that worth it. Smarter lions or gophers still can't make tools.