Hubble Trouble, Oil, and Bubble [From the Editor]

We've all heard the legend that it's possible to boil a live frog without the frog jumping out of the pot. The trick is to use quasi-static control, where the temperature is increased sufficiently slowly that the frog doesn't detect the conditions leading to its demise. Since the cold-blooded frog can presumably feel temperature, what he seems to be suffering from is the inability to sense low-frequency changes in temperature. This is a little bit like watching the grass grow–we know it grows, but it grows so slowly that we can't detect the change; our eyes lack the resolution needed to estimate derivatives near dc.