The laws of motion are not independent of time and place. Time and space are values that can be different depending on one’s frame of reference. Moving clocks run slower than stationary clocks and moving rulers are shorter than stationary rulers. This means that two people can get different results when measuring the time and distance of moving objects and they both can be right. Hence, the type of invariance that physicists anticipate is not that the laws of motion will be independent of time and place, but the principles governing temporal and spatial variation will remain unchanged. Is this true?