What number when divided in half becomes zero?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

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

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

What has one eye, but can’t see?

Prove that the below maths equation is true.

8 + 8 = 91

Which alphabet is a part of our body?

What is the centre of gravity?

What can you hold in your right hand, but never in your left hand?