sometimes i wunder if time realy exists. just because you can use it to callculate projectil motion or whatever, is it actually a physical issue or is it just the human way to deal with a situation? do you know what i mean? what if clocks can tell your passage from the past to now but nothing actually happened in physics, only things that can age have, from diferent forms of decay. if time is not real then time travel would not be possible and alot of the physics equations would be wrong...E=MC^(2)?