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

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

There were three women in all the swimming costumes!
One was happy and the other two were sad!
The happy one was crying and the sad ones were smiling.
Why was this?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

What question can you never answer yes to?

I’m tall when I’m young, and I’m short when I’m old. What am I?