Communication is a tricky skill. Humans begin to communicate even before they are born. A baby will communicate to the mother if she's uncomfortable with a kick or punch. Once the child is born, they'll communicate through sounds (mostly crying), and their actions (sleep). As mother and child grow closer, their communication also becomes more effective. Crying becomes more nuanced. Crying grows from "what does this kid want?" to "She's hungry" or "She's sleepy", etc. As we get older, we lose this effectiveness. This is partly because we...