I have a friend who likes to drink coffee every morning - one of the few luxuries he allows himself throughout the day.
One day, I notice that he drinks his coffee without any type of protection for his hand - no coffee sleeve, no second cup, nothing between the paper and his own skin.
Now, his hand is a normal, perfectly functioning hand, he is holding a perfectly normal disposable coffee cup with it, I can tell it has no insulation material of any kind, and I know that he doesn't ask for cream or sugar, so this has me slightly alarmed.
Nevertheless, he assures me that he is in no danger of burning his hand.
I'm skeptical, but I've never noticed him flinch when grabbing his cup - how is he so safe to drink his coffee freely?