The Biosphere in 1991 was the largest enclosed experimental environment and today continues to benefit research for the purpose of humans living on the moon and/or mars. In 1991 8 scientists (4 males and 4 females) walked into the enclosed structure and lived there producing their own food and conducting experiements for two years. The Biosphere is glass-enclosed and includes several environments ---- tropical and desert, ocean, rainforest, etc. Fascinating tour! Worth the stop!
We stopped there a few years back. It was pretty interesting!
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