I realize this isn't a physics forum, but if anyone has an idea what's going on here, I'd like to hear it. Was reading a blog post about homemade yogurt & came across this in the comment thread: I was skeptical, to put it mildly. How is the bottom of the pot supposed to remember that it was cold before it got hot? What sort of force-field does this little bit of water on the bottom of the exert after you dump a half-gallon of milk on top of it? I make yogurt all the time, always get a pretty significant layer of scorched milk on the bottom of the pan (a heavy SS/aluminum sandwich-bottomed Vollrath) which is a PITA to scrub off; I thought what the heck, I'll give it a try. It works. Does anyone know why? I suppose in the name of science I should touch a metal utensil to the bottom of the pan sometime & see if that breaks the magic spell.