What do you call a fish without an eye?

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

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

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

Explain how?

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

What is so fragile that saying its name breaks it?

Look at the picture and find out which square is not linked with any of the other squares.

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

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?