Short hard clean riddles

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

Something very extraordinary happened on the 6th of May, 1978 at thirty-four minutes past twelve a.m. What was it?

What goes through towns up hills but never moves?

They are twin sisters, same height; they work in the kitchen, arm in arm. Whatever is cooked, they always try it first.

What is everthing yet nothing, has no start and no end, creates yets destroys, brings life and death what is it?

I am the biggest alphabet, as I contain the most water in the world. Who am I?

What starts with "P" and ends with "E" and has more than 1000 letters?

If I have it, I don't share it. If I share it, I don't have it. What is it?

I am a fruit. Remove my first letter, it's a crime. Remove my first and last letter, it's a kind of music. What do you think am I?

I have four legs but no tail. Usually I am heard only at night. What am I?