Does anyone have a reference to an explanation of special relativity for ignorami? I just can't understand it, specifically the twins in the spaceship example.
Basically twins are born on earth. A spaceship takes one of the twins and travels near the speed of light away from earth. At some point it turns around and returns to earth. The twin on earth appears to have aged much faster than the twin on the space ship.
I can't understand this. Isn't time (whatever time is) constant? I mean our biology progresses at the same rate, regardless of what speed you happen to be traveling at?