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

When does a USA Potato change its nationality?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

Out of four images which one is the odd one out?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What occurs twice in a week, once in a year but never in a day?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

What is always in front of you but can’t be seen?

There was a strange boy who was born before his father. How can this be possible?