We are advised to behave in a rational manner. Apply logic and science, say experts, so you do not fall into the pit of probabilities and irrational decision-making. That's because irrational thoughts enter our brains and affect our actions more often than we'd admit, say experts who point out that irrationality seems to carry plenty of drawbacks. But this gives overworked brains some rest.
Human beings are wired to prioritise safety and security. But the world has changed rapidly over millennia, while we haven't been paying attention to upgrading the brain's capacity to deal with new situations and challenges. Says Rankin, a clinical psychologist, 'We are basically still Neanderthal, focused on survival and safety and living in the present. Our brains haven't adapted to a much more complex world.' Moreover, the human brain takes up more than 20% of our energy, and Rankin says because critical thinking can be exhausting, we rely on simplistic shortcuts.