Do you want to wake up earlier, exercise more or stop smoking? The emergence of habitual behaviour involves dopamine production and brain systems in the basal ganglia and cortex. Not a neuroscientist? In short, you have to trick your brain.

On other matters, a recovering Pope Francis is celebrating Holy Week. He is the first pontiff from the southern hemisphere, and the only non-European pope in nearly 1,300 years. His election reflected a broader geographical shift in the church. We look at how its centre of gravity is moving.