The human skin is amazing. It really does protect our insides. It doesn't do a real good job of keeping us warm, though. In most climates, we do need clothes to stay warm enough.
What if we had fur? I wonder why, in the course of evolution, did we shed our fur?
Our skin keeps liquids from penetrating our layers of skin. It is made of good tissue. Why then, is the skin of a baby so soft and supple and a senior is getting wrinkles and funny spots?