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

What does this Rebus Picture mean?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

The answer I give is yes, but what I mean is no. What was the question?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

What begins with T, ends with T, and has T in it?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C