The more we learn about genetics and the brain, the more impossibly complicated both reveal themselves to be. We have picked no low-hanging fruit after three decades and $50 billion because there simply is no low-hanging fruit to pick. The human brain has around 86 billion neurons, each communicating with thousands of others via hundreds of chemical modulators, leading to trillions of potential connections. No wonder it reveals its secrets only very gradually and in piecemeal fashion. – Aeon