One I've been wondering about recently... In a closed room, assuming no localised effects of sunlight/heating, over time every inanimate object in it assumes the same temperature as every other object, including the air in the room, yes? So why is it that touching a metal surface, it feels considerably colder to the touch than the background temperature of the room? How can that be? Similarly, if a car is left outside all night in freezing temperatures, why is it that frost seems to accrue on the metal surfaces differently to the glass and differently again to rubber surfaces like the tyres?