Here are two snakes. One is harmless, the other will kill you. You have to know the colour sequence to differentiate a coral snake (deadly) and a milk snake (harmless). This is how living creatures survive, by recognising patterns, by getting it right. We recognise faces similarly, and expressions that mean friendly or aggressive. We are terribly good at it. In fact we are so good, we naturally categorise everything, creating a mental instant index of what is safe and favourable, unsafe and unfavourable. It is best not to have a lot of fuzziness in between, because doubt takes time,…