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Biosphere 2 The Second Earth Experiment of the 1990s
Featured in Ripley's Believe It or Not!
Biosphere 2
Believing they could create a perfectly sealed vivarium for all the plants, animals, nutrients, and people needed to become self-sustaining, a company called Space Biosphere Ventures built a massive complex, dubbed Biosphere 2. The Earth itself, they asserted, was the first biosphere.