Hey, this is my first post. I am a biology major so I know pretty much nothing about physics, yet sometimes it interests me way more than chromosomes do. So, given that I know nothing about physics, this is probably going to sound like a stupid question. But I've always wondered how it is possible that a person A moving at speed observes light emitted from their frame of reference at c, and then a person B sitting still (relative to person A of course) sees that same light travelling also at c. It seems like that just shouldn't happen. So I think I'm right when I say it has something to do with space and time being perceived differently depending on how fast you are going. I guess when you are moving quickly, a meter seems shorter and/or a second seems longer than when you are moving more slowly? And since c is m/s, well, that explains it right? But I really have no idea. Someone rescue me from my misconceptions and more fully explain to me why this is happening!