Tranceti is triggered by the endorphin system in the brain. It's part and parcel of the social bonding mechanism for all monkeys and apes and humans. The action of leafing through the fern triggers the endorfin system, a very specialized mural system. But once we got to the sort of archaic human stage half a million years ago, there was a push to increased group sizes - or push groups beyond the size that could be bonded just by grimming alone. We are dealingh with really quite small groups. O, know, that's why physical touch is so important in our closer relationships.

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