Is there a physicist in the house?

Not quite. The uncertainty principle says that certain pairs of measurements cannot be made to a greater combined precision than a particular constant. One of those pairs is location and momentum: when a particle's position and momentum are measured, the product of the uncertainties in the measurements cannot be less than Planck's constant (loosely put; it may be Planck's constant over two pi or some such). Indeed, I've seen it said that a particle _does not have_ position and momentum to greater combined precision than permitted by the Uncertainty Principle - not just that there are "true" values we just cannot measure with certainty, but that the supposed true values do not exist. Yes, it's grossly counterintuitive. Quantum mechanics is like that. There are some problems here. First, if you aren't constantly observing <thing>, you can't tell whether it's the same <thing>. Second, your magnitudes are _way_ too high. For objects of macroscopic size - the sort of thing your physical intuition leads you to picture - the uncertanties are, quite literally, lost in the noise. For example, if you try to measure the location of a mustard seed, the uncertainty demanded by the Uncertainty Principle is so small that the molecules constantly evaporating from and being re-absorbed by the seed's surface provide plenty of uncertainty. /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse(a)rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B