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Humans have been greeting each other for thousands of years. It should be the most straightforward thing in the world, but this seemingly simple act is fraught with complications, leading to awkward misunderstandings, intercultural fumblings, and social gaffes that can potentially fracture relationships forever.Why is that? Why are greetings so important? Is there a right and wrong way to say hello? In his illuminating book One Kiss or Two?, Andy Scott--a well-traveled former diplomat and no stranger to botched first contacts himself--takes a closer look at what greetings are all about. In discovering how they have developed over human history, he uncovers a kaleidoscopic world of etiquette, body-language, evolution, neuroscience, anthropology, and history.