Why is it that hairs tend to grow so much faster on moles than on normal skin?

During an A-Level physics lesson we were shown a cross-section of a super-conductive wire that consisted of copper wire strands and several super-conductive fibres. If a super-conducting material has no resistance what-so-ever, then surely an infinite current can be passed through it (V=IR) and so what is the need for more than one super-conductive fibre?

I am (quite unfortunately) prone to blushing. So i'd like to know a bit more about the condtion that plagues me so regularly.

1- Why do we blush and why on earth did evolution put it there?!2- Why do teenagers blush more than adults and young children?3- Where does the redness come from and how does it go away so quickly?4- Why do blushes range from rosy pink to tomato red?5- And finally, is there anyway to stop yourself from blushing?

You don't have to answer all of them since I have asked quite a few.

Thanks!