Why Aeroplane windows are round?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

I look at you, you look at me, I raise my right, you raise your left. What am I?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What number divided by 4 is the same as that number minus 4?

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

Can you find out which options fits best with the missing column?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Spot 5 differences in two Christmas tree below: