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

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?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

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

What kind of storm is always in a rush?

I can write cow in 13 letters.

Can You?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

Can you start the fire using two pieces of wood?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

10+10 and 11+11 can give you the same answer.

Explain how?