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

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

You can see it everyday, But cannot touch it at will. What is it?

How can one talk without saying a single word?

Before Mount Everest was discovered, what was the highest mountain in the world?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

There is a family that live in a round house. The two parents go out for a movie and leave a babysitter to watch their son. They come back and the kid was not there. Some one kidnapped him. The maid said she was cleaning in a corner. The cook said he was making pizza. The babysitter said she was getting a board game. Who kidnapped him.

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 is the last thing you take off before bed?