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Sarah Kocher wants to understand what shapes variation in social behavior. Her lab has developed new tools to study social behavior across different scales, from the molecular building blocks of the “social brain” to the ecological and evolutionary forces that shape social evolution. Her research focuses on a unique group of bees that includes solitary, social, and socially flexible lineages. In these bees, social behavior has been independently gained and lost multiple times, creating an ideal framework for uncovering the factors shaping social behavior and its evolution.