A father's child, a mother's child, yet no one's son.

Who am I?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

Why do you find that most of the buildings are deprived of the 13th floor?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

There are two words one resembles the "state of rest" and the other is related to "writing/reading material".

Can you name these two words which also sound similar?

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?