I make two people out of one. What am I?

I am something people love or hate. I change people's appearances and thoughts. If a person takes care of themself I will go up even higher. No matter how hard people try I will never go down. What am I?

I am white when I am dirty, and black when I am clean. What am I?

My life can be measured in hours, I serve by being devoured. Thin, I am quick. Fat, I am slow. The wind is my foe. What am I?

This is as light as a feather, yet no man can hold it for long. What am I?

I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I am used by almost everybody. What am I?

The more you take away, the more I become. What am I?

I have two hands, but I can not scratch myself. What am I?

I am the beginning of the end and the end of time and space. I am essential to creation, and I surround every place.