I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

What is the centre of gravity?

What does a man do only once in his lifetime, but women do once a year after they are 29?

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

Different lights make me strange by changing me into different sizes. What am I?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Decode this picture on T-Shirt and tell what it says ?

What has a bottom at the top?

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?