[Greg] wondered if they could be put to good use cooking an egg, and got down to work. The handwarmers in question are the HotHands brand, based on an iron chemistry. The warmers create their heat ...

Hard boiling an egg can yield a chalky yolk, while cooking low and slow can produce jelly-like, undercooked whites. Researchers cooked hundreds of eggs and used math to tackle this runny conundrum.