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Child development research. Researcher observing a child in front of a mirror. The child has a mark placed on her face to see if she is able to recognise that it is her image in the mirror. 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)