Comment on Uncertainty in measurements of distance

We have argued that quantum mechanics and general relativity give a lower bound (delta)l >~l^1/3l^2/3P on the measurement uncertainty of any distance l much greater than the Planck length lP. Recently Baez and Olson have claimed that one can go below this bound by attaching the measuring device to a massive elastic rod. Here we refute their claim. We also reiterate (and invite our critics to ponder on) the intimate relationship and consistency between black-hole physics (including the holographic principle) and our bound on distance measurements.