My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Can you name an animal whose killing cannot be performed without spilling your own blood?

What does below rebus means ?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

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.

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

What's the best place to go shopping in the ocean?

John killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Rearrange the letters in "new door" to make one word.