Why Aeroplane windows are round?

Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?

What brings you down but never up?

What does a man do only once in his lifetime, but women do once a year after they are 29?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

10+10 and 11+11 can give you the same answer.

Explain how?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?