Say a fireball streaks across the sky & lands nearby. You rush over & see broken meteorite fragments. You want to pick one up, but you’re worried they might still be hot. Fun fact from meteor scientist Richard Pugh: you’re more likely to get frostbite than a heat burn. The 5/6 seconds it takes to pass through the atmosphere isn't enough for heat to conduct to center of the meteor. The inside will still be the temp of deep space - as cold as -200 C, says Pugh, though we say -20 C more likely.