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Students from all continents cooperate and collaborate to reproduce one of the science's 10 most beautiful experiments of all time: Eratosthenes' measurement of the Earth's circumference. A global project in collaboration with: La Main à La Pàte; Bibliotheca Alexandria; Universidad de Buenos Aires; Universidade Federal de Itajubá; Astrofanaticos (Colombia); Space Adhyaan(India); Parque Cielos del Sur (Argentina)