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December 31, 2015 We Smile for Photos Much More than We Used To Smiling for the camera has increased over time, according to a new study led by Shiry Ginosar at the University of California, Berkeley. The researchers collected a century’s worth of high-school yearbooks from around the U.S. to create a data set of 37,921 student portraits. They found a rapid increase in the popularity and intensity of smiles in photographs from the 1900s to the 1950s — a trend that still continues today. They also observed another trend: women consistently smile more than men. This analysis demonstrates how data-driven methods can discover historical visual patterns and gradual changes in social norms, the authors say. Source: A Century of Portraits: A Visual Historical Record of American High School Yearbooks

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