Can you convert the number zero(0) into a positive number using just one mathematical operator ?

In the Wild West, you are challenged into a death match by two bounty hunters nicknamed Golden Revolver (GR) and Killer Boots (KB). You accept the challenge. None of you want to waste any of the bullet and so a certain rules are laid down:

1) All of you will shoot in a given order till the last man standing.
2) Each of you shoots only once upon his turn.
3) If any one of you is injured, the other two will finish him off with an iron rod.
4) The worst shooter of all (which is you) shoots first and the best one shoots at the last.

Now, how will you plan things if you know that you hit every third shot of yours, KB hits every second shot and GR hits every shot ?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

What number do you get when you multiply all of the numbers on a telephone's number pad?

Which is the smallest number that you can write using all the vowels exactly once?

Solve the following series:
AZ, GT, MN, __, YB

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Who always enjoys poor health?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

The Little ant seems to be always confused. Do you know why?