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Child development research. Researcher (right) studying the impact of taste preferences in determining feeding behaviour in children under 2-years-old. The scientist and father (left) are wearing a masks so as not to influence the child with reactions that would be visible on their faces. Photographed at the National Center of Scientific Research (Centre national de la recherche scientifiquee, CNRS), Salpetriere, France. (KEYSTONE/SCIENCE PHOTO LIBRARY/THIERRY BERROD, MONA LISA PRODUCTION/ SCIENCE PHOTO LIBRARY)