Hey, i don't know if this is the right spot to post this question, but I was reading "The Universe in a Nutshell" by Steven Hawkins. Got through the first few pages. I am just wondering what is "Einstein's postulate that the laws of nature should appear the same to all freeli moving observers was the foundation of the theory of realtivity, so called because it implied that only relative motion was important." This is very weird to me. Also, what did they mean by The speed of light always travel at the same speed relative to you or that object?