I killed the beans.

Alas, the mung bean sprouts didn't make it. In retrospect, I kept them too wet, and they promptly molded. After throwing out the mess, I looked up how I should have done it in the first place, and I was never supposed to leave them sitting above/in water like that. Oops. And you're supposed to rinse them daily, presumably to get any fungus off them. So, trying again with another batch.