I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

What jumps when it walks and sits when it stands?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

What kind of band never plays music?

Can you find a five letter word that is left with only two letters if one is removed?

10+10 and 11+11 can give you the same answer.

Explain how?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?