Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

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

Do you know what I am?

Consider all the numbers between 1 and 1 million. Among all these numbers, there is something very special about the number 8 and the number 2202. What is it?

There was a strange boy who was born before his father. How can this be possible?

How can you tell a raw egg from a hard-boiled egg?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?