There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

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

What's the only room from which no one can enter or leave

What has one eye, but can’t see?

What do you think with the below Picture ?

For this puzzle, you might have to find logic in something illogical. But hey, it's fun and a healthy little break from your strenuous puzzle-solving sessions.

Can you decipher the meaning in the following cluster of letters?

ITIT,NCENTCENT

Name a key which is hardest to turn.

What is the centre of gravity?

Which alphabet is a part of our body?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?