There was a minor stir a few years back when some American scientists bred a strain of gene-edited hamsters with the chemical that causes anger removed, presumably so they could achieve one of humanity's historic goals: the dream of a more docile hamster. Unfortunately the opposite happened. What the scientists created was a race of hyper-angry hamsters. These were described a little glibly in the media as Mutant Rage Monsters. But science is always more nuanced than this.