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The head of the "Boeoegg" burns on the Sechselaeuten place in Zurich, Switzerland, pictured on April 8, 2019. The Sechselaeuten (ringing of the six o'clock bells) is a traditional end of winter festival with a parade of guilds in historical uniforms on horseback and the burning of the Boeoegg, a symbolic snowman, at 6 pm. The faster the Boeoegg explodes, the hotter the summer will be according to traditional weather rules. (KEYSTONE/Ennio Leanza)