At dawn outside Oracle, Ariz., this week, amid Indian chants and whirring cameras, four men and four women clad in bright red jumpsuits will wave % farewell to this world and enter a newly minted one. For two years they will live inside a sealed terrarium, about the size of 2 1/2 football fields, that mimics a more primitive earth. Tending their crops and livestock, they will receive nothing from outside. Dubbed Biosphere 2 (the earth is Biosphere 1), the glass-and-steel-enclosed structure has been seeded with 3,800 species of plants and animals in five different wilderness ecosystems: a desert, savannah, rain...
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