2, 3, 5, 9, 17, _ What is the next number in the sequence?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

It is always ahead of me yet I can never see it. What is it?

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

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

You can hear me, but you can't touch or see me.

What am I?

A man wants to cross the pit of fire which is 25 feet in length and he has 2 planks(fire resistant) 19 feet in length. How can he cross the pit of fire alive?

Before Mount Everest was discovered, what was the highest mountain in the world?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?