Aux XVIIe et XVIIIe siècles, le temps était beaucoup plus froid que de nos jours et la Tamise, fleuve qui arrose Londres, en Angleterre, gelait régulièrement. La dernière Fête du gel a eu lieu en 1814.
Combien d’années se sont écoulées depuis cette date ?
Lors de ce rituel, les élèves doivent tenter de résoudre un problème donné.
La démarche de résolution et la compréhension du problème donné compte plus que le résultat.
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