What always comes into a house through the keyhole?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

81 x 9 = 801. What must you do to make the this equation true?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Why did Buffon take the goal with him after every Juventus match?

A man dies of old age on his 25 birthday. How is this possible?

A guy in his thirties is found dead in a forest. The shocking thing about the body is that he is wearing his swimming trunks snorkel and a facemask.

For your information, the nearest lake is some 10 miles away and the sea is hundreds of miles away.

How did he die then?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?