Yesterday was a good day for bunnies: Scientific American reported that researchers now have a new way of testing toxicity that doesn't involve adorable, helpless (and scientifically useful) animals. Instead, it involves lab-grown human skin.

It sounds like something out of science fiction—but at the same time it seems kind of weird that it hasn't been done yet, mainly because it has the potential to be very, very useful. We come into contact all day with things—from personal care products to household cleaners—and we don't know nearly enough as we need to about their safety. One of the big problems with toxicological testing has always been the fact that there's no ethical way to test chemicals on human subjects—and so scientists have relied on animal data.

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