I've been asked by many people on what is a nerd.
So, I'll try to give an answer:
A nerd is someone who is specially interested in a science,
mostly informatics or electronics.
He doesn't accept a fact, he wants to prove it.
Many people think nerds a kinda uncivilized, but this isn't true.
In fact our whole culture is based on people who devote their life solving the questions, they are surrounded with.
Not every scientist is nerd, and not every nerd is a scientist,
but they both have some things in common.
You don't have to call yourself a nerd.
If you want to know how things work around you,
your what I would call nerdy.
So keep your eyes open.