In this age of digital hyperlinking, it’s more important than ever to understand the links between humans. You might assume that you end at the border of your skin but there’s a sense in which there’s no way to mark the end of you and the beginning of all those around you. Your neurons and those of everyone on the planet interplay in a giant, shifting superorganism. What we demarcate as you is simply a network in a larger network. If we want a bright future for our species, we’ll want to continue to research how human brains interact — the dangers as well as the opportunities. Because there’s no avoiding the truth etched into the wiring of our brains: we need each other.