If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Name a key which is hardest to turn.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

As shown in the picture below, we can see a boy hanging on the tree branch to save his life. There are various ways in which he can die like1. A snake hanging toward the right waiting to bite the boy.2. A roaring Lion near the tree.3. Two crocodiles are ready to attack if the boy reaches near water. The tree is chopped to some extent, so can fall as if he moves a lot. Can you give this boy an escape plan?

Can you name four days which start with the letter 'T'?

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

Why is the longest human nose just 11 inches?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you start the fire using two pieces of wood?

Why are all black people so quick ?