No evolutionist has explained, as far as I've seen, why humans would have evolved to lose all their body hair, which would seem to actually be very protective and a distinct advantage.
Another mystery unsolved.
If all women were hairy like apes (like in Europe) some men might be less attracted to them (today at least). The human race has figured out how to keep warm, but still needs to procreate to survive.
The biggest mystery to me is in regard to plant life. Plants require carbon dioxide to survive, yet our atmosphere consists of only 0.04% CO2. If plants had evolved, they would have found a way to create energy from oxygen or nitrogen instead.
We haven't lost all our hair (just ask John Kerry) but we have less because our ancestors evolved on the savannah, where heat regulation is a prime concern. Having too much body hair is also a hindrance more than it is a blessing -- you can take off a winter coat when it's hot, but you can't as easily shave. That makes it easier for us to inhabit a wider variety of climates.