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Smile: The Astonishing Powers of a Simple Act (Kindle Single) (TED Books) Editorial Review: How can something as simple as a smile be so deceptively complex? Thatâ€™s the mystery and magic explored in Smile: The Astonishing Powers of a Simple Act. From the broad beaming grin of a toddler to the oily smirk of a used car salesman, smiles convey an enormous range of emotions, from joyously happy to nervous or sad. Grins also have radically varied meanings in different cultures, as the author learned during his worldwide trips to explore the complicated, but ubiquitous, act of smiling.