Hi Guys, Newbie question from a layperson so please don't beat me up! :D I know that Heisenberg's Uncertainty Principle relates to measurement/observation of particles with regard to quantum physics. My question is whether or not it applies to measuring anything in the observable Universe. i.e..: A foot race between friends where pushing the button on a stopwatch causes some air to brush past the racers, The measurement of voltage/current/impedance of a circuit where the multimeter's leads adds impedance to the circuit or a drain on the current being measured. I can't relate it to the measurement of time with a clock. Might sound like a silly question, but is there an accepted answer? Cheers, Art.