[quote]The league of shadows had the perfect plan to destroy Gotham. By sneaking-in a toxin in the water supplies for weeks before revealing their machine and its purpose, their tactical supremacy was everything but challenged. That is.... unless a single person out of the millions of Gothamers used boiled water in the past few months. But what are the odds of any of them taking daily showers and cooking food ? Exactly. None. And that is off course hiding the other tiny problem of human bodies being composed at 60% of water.[/quote] This is the ultimate, absolutely unmatchable plot hole.

I'm an idiot. I don't understand. Hot water neutralized the toxin?

BTW, the boiling water thing isn't the biggest part. It's that if humans are composed of 60% water, the Microwave Emitter would have boiled them from the inside as well, killing pretty much everyone.