<s>[INST] I've been searching for someone to help me understand Einstein's theory of special relativity. It's a concept that seems simple but yet I don't get it.

You're a specialist in this area and I'd like your help in understanding this concept. I've read all the books and seen the documentaries but I still can't fully grasp the concept. 

I'm worried that I'm not smart enough to understand it. Could you help me see it in a different way or is there a particular part of the theory that people usually struggle with?[/INST]