If you could take your brain and zoom in a couple of times – and then a bit more – you’d see structures that look like towers and tentacles, and behave like pieces of automatic Lego. It’s a crazy miniature world, and one we’re going to get a tour of today.Our tour guide is Dr Kiara Bruggeman, who’s hijacking and hacking these nano-sized structures, in the hopes of helping stroke-affected brains heal.