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

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

What goes up but never comes down?

There were five men at church, and it started raining while they were outside. The four that ran still got wet, but the one that was still stayed completely dry. Why did he stay dry?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

Alex opened 24 presents
Jonah opened 8 presents
Clara opened 1 present

Can you find out how many presents were opened by Candy?

What number when divided in half becomes zero?

What month of the year has 28 days?

Which alphabet is a part of our body?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?