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

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

I am sure no one can have two things for dinner. what are they?

What has a bottom at the top?

You can see it everyday, But cannot touch it at will. What is it?

What you cannot hold but it is yours?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?