I've just read part of Einstein's book on relativity (for a physcis project in highschool). I just need clarification on a few points: The theory was figured out because it was found that light speed is the same relative to you, and your friend, and... (everything). Things get shorter when they go faster, they move slower through time when they go faster, etc. Right? Does the change in speed/distance cancel out the whole "light is different for me than it is for you" thing? (I don't think it does, I'm not sure if it should?) It's impossible to reach lightspeed because the energy required goes up. (Lightspeed relative to what? I thought it was relative to you??? How can you know if you're approching light speed if light is still going c faster than you??) :grumpy: The general language in the book is "ALMOST" over my head. I think I'll need to read it twice..