Clean riddles

I build up castles. I tear down mountains. I make some men blind, I help others to see. What am I?

How do you make the number 7 an even number without addition, subtraction, multiplication, or division?

What is harder to catch the faster you run?

What does the following represent? N N N N N N N A A A A A A A C C C C C C C

I am always will be coming, but I will never come. What Am I?

I am an odd number; take away a letter and I become even. What number am I?

It’s been around for millions of years, but it’s no more than a month old. What is it?

In medieval England, a king's jester was imprisoned (the king didn't like the jester's jokes). The jester was locked in a room at the top of a high tower. The room had only one tiny window. The jester found a piece of rope. It wasn't long enough to reach the ground. So, he divided it in half and tied the two halves together. This made the rope long enough and he escaped. How?

I drift forever with the current down these long canals they've made. Tame, yet wild, I run elusive, multitasking to your aid. Before I came, the world was darker. Colder, sometimes, rougher, true. But though I might make living easy, I'm good at killing people too.

I go around in circles, but always go straight ahead. I never ever complain, no matter where I am lead