Your brain's nerve cells communicate by releasing chemicals called "neurotransmitters." Up until now, brain tech has focused on electrically triggering existing nerve cells to release neurotransmitters--a microscopic version of shock therapy that's only just as effective in many cases. Now, some scientists have built a system that replaces nerve cells with machines that can pump neurotransmitters down a nerve path. We're not anywhere near "productization" here, but isn't it nice to know that one day your kids will sign a waiver allowing that, in the event of derangement, your brain can be replaced by a hunk of plastic? [PopSci]