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It was certainly true that I had __o sense of humour_ in that I found nothing funny. I didn__ know, and perhaps would never know, the feeling of compulsion to exhale and convulse in the very specific way that humans evolved to do. Nor did I know the specific emotion of relief that is bound to it. But it would be wrong, I think, to say that I was incapable of using humour as a tool.As I understood it, humour was a social reflex. The ancestors of humans had been ape-animals living in small groups in Africa. Groups that worked together were more likely to survive and have offspring, so certain reflexes and perceptions naturally emerged to signal between members of the group. Yawning evolved to signal wake-rest cycles. Absence of facial hair and the dilation of blood vessels in the face evolved to signal embarrassment, anger, shame and fear. And laughter evolved to signal an absence of danger.If a human is out with a friend and they are approached by a dangerous-looking stranger, having that stranger revealed as benign might trigger laughter. I saw humour as the same reflex turned inward, serving to undo the effects of stress on the body by activating the parasympathetic nervous system. Interestingly, it also seemed to me that humour had extended, like many things, beyond its initial evolutionary context. It must have been very quickly adopted by human ancestor social systems. If a large human picks on a small human there__ a kind of tension that emerges where the tribe wonders if a broader violence will emerge. If a bystander watches and laughs they are non-verbally signaling to the bully that there__ no need for concern, much like what had occurred minutes before with my comments about Myrodyn, albeit in a somewhat different context.But humour didn__ stop there. Just as a human might feel amusement at things which seem bad but then actually aren__, they might feel amusement at something which merely has the possibility of being bad, but doesn__ necessarily go through the intermediate step of being consciously evaluated as such: a sudden realization. Sudden realizations that don__ incur any regret were, in my opinion, the most alien form of humour, even if I could understand how they linked back to the evolutionary mechanism. A part of me suspected that this kind of surprise-based or absurdity-based humour had been refined by sexual selection as a signal of intelligence. If your prospective mate is able to offer you regular benign surprises it would (if you were human) not only feel good, but show that they were at least in some sense smarter or wittier than you, making them a good choice for a mate.The role of surprise and non-verbal signalling explained, by my thinking, why explaining humour was so hard for humans. If one explained a joke it usually ceased to be a surprise, and in situations where the laughter served as an all-clear-no-danger signal, explaining that verbally would crush the impulse to do it non-verbally.