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Tuesdays at the Espace des sciences with Vincent Perrichot, Paleontologist, “Biodiversity: interactions, preservation, evolution” team, Laboratoire Géosciences Rennes (OSUR, University of Rennes 1, CNRS). From modest beginnings around 120 million years ago, ants have diversified widely to become the most abundant social insects today, with a major ecological impact. But what did the first ants look like? Where did they appear and how did they colonize most terrestrial environments? Many fossils discovered over the past decade have allowed for spectacular progress in our knowledge of their evolutionary history.