Why Aeroplane windows are round?

What goes up but never comes down?

There is something which you can be arrested for attempting but not for successfully completing.

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

If you go to the movies and you're paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA