A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?

What happened when the wheel was invented?

A blonde put eyeliner on her head. Why?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Rearrange the letters in "new door" to make one word.

What is the centre of gravity?

Four friends are sitting on a tree. Each one of them is wearing a hat. They don't know which coloured hat are they wearing but they do know that two of them have green hats and two of them have orange hats.

Adam is sitting on the top branch and he can see the hats of Billy and Cyrus. Billy is sitting on a branch above Cyrus and he can see Cyrus hat. Duke is sitting at the base of the tree. Branches are covering him fully and no one can see his hat.

Now they are not allowed to look upwards. Who do you think will shout the colour of his hat first?