Which number should replace the question mark?

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

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?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

John and Jill are madly in love with each other. To remind Jill of his pure love, John wants to send her a ring by post but in their country where burglary is quite prominent, any package that is not locked comes under the risk of being stolen for the contents.

John and Jill possess many padlocks but neither one of them has the other key.

Can you find a way John can send the ring to Jill safely?

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What jumps when it walks and sits when it stands?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?