I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

I have Rs.50 and I spend it in the way as below.

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?

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

A man walked into a pub and went straight towards the Barman. He asked for a dirty martini from the Barman. The Barman thought something and then pulled out a pistol from his drawer and aimed it directly at the man. Why did he do that?