[math-fun] Do sweat it

Sprinkle some water on the horizontal inside surface of the opened glass door of a room-temperature toaster oven. Close the door, and wait half a minute for the larger drops to run down. Press TOAST. What happens to the remaining drops? I would have expected them to evaporate. Instead, they run down in decreasing order of size, at least for me, well before reaching the boiling point. Why?? --rwg