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

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?

What seven-letter word has hundreds of letters in it?

Prove that twice of ten is the same as twice of eleven.

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

When is the top of a mountain similar to a savings account?

Which city is three-fifths chick two third cat and 50% goat?

What is the difference between a jeweller and a jailer?