There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

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

You bought me for dinner but never eat me. What am I?

What can jump higher than a building?

What's the only room from which no one can enter or leave

A bomb exploded in a room full of married couples and no one died. How?

What has a bottom at the top?

When we see 2 but call 10?

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.

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?