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

What question can you never answer yes to?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

This is a most unusual paragraph. How quickly can you find out what is so unusual about it? It looks so ordinary, you'd think nothing was wrong with it. Actually, nothing IS wrong with it. But it is not as ordinary as you might think. If you think about it for a bit, you will find out why it is truly so unusual. So what is it? What is so unordinary about this paragraph?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?