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Humans surprisingly use smell to greet each other. Noam Sobel of the Weizmann Institute of Science conducted an experiment to test the number of times that participants brought their hands to their faces after they had or had not shaken hands with a researcher. People who had been greeted with a handshake were more likely to bring their hand toward their face and nose than those who had not had a handshake. In this way, Sobel predicts that pheromones are being exchanged.
Contributed by Katlyn Powers