This is where the whole mind-control business comes in. One of the most powerful, technologically-advanced tools in the neurobiology arsenal is technique that, when described broadly, sounds a lot like mind-control. Technically, it might even be mind-control, depending on how you define it. But it’s so much more nuanced than that. The technique is called optogenetics—“opto” for “light” plus genetics for, well, you get it. There are a couple different ways to use optogenetics, but this paper used a particularly precise method.