re: #782 Jim D

There is no way in even in principle to make absolutely precise simultaneous observations of position and momentum of a particle.
It follows from the mathematics of quantum mechanics without even defining the nature of the observation.

If my proposed physical change was made so that light did not impart energy to its object, one could measure to an arbitrarily high degree of precision by using arbitrarily high frequency light as one’s measuring device. However, one could not measure one’s object with absolute precision, for that would require the existence of light possessing an an infinitely high frequency, and the existence of such light is of course a physical impossibility.