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Tuesdays at Espace des sciences with Jean-Sébastien Steyer, paleontologist at the National Museum of Natural History in Paris and at the CNRS. The existence of dinosaurs is fascinating. We often talk about them, but before that, what was there on our planet? 250 million years ago, on this vast and unique land called Pangea, lived large herbivorous or sabre-toothed reptiles, giant “salamanders”. A true bestiary worthy of science fiction, essential for our understanding of the evolution of species.