What’s happening in your brain when you solve crossword or sudoku? Looks like a billions neurons get into action to solve the problem. Maybe not, a research suggests that our brain activity perhaps isn’t as complicated as we thought. Most of the time, our brain is directing traffic along pretty well-established routes, and even when it needs to get creative it is still trying to send the traffic to the same ultimate destination. How does the brain achieve this? One possibility is Thalamus, a structure that lies deep in the brain but is connected to almost the entire rest of the brain.