Why do we preferably have round manhole covers and not square ones?

Can you Find and name the hidden bird in the picture below ?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Can you count the number of blocks in the picture below?

They are three errirs in this question. Can you find them?

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?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

Why is it very easy to weigh a fish?

Different lights make me strange by changing me into different sizes. What am I?