How many sides does a circle have?

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

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

O_er_t_o_

Complete the missing letters of the given word.

How many times can you subtract the number two from the number fifty?

What breaks yet never falls, and what falls yet never breaks?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

If an electric train is travelling south, then which way is the smoke going?