Killing germs by microwaving sponges. We've covered this before on Serious Eats, but the New York Times brings it up today. Effective but not without risk, the paper says. Namely from too-dry sponges, which can catch fire after a spell.
Serious Eats reader pageycooks offers another perspective: "I tried this once—afterwards, I had to 'de-stink' my microwave."
Yuck. That's another argument for just throwing it out and buying a new one. They're cheap!