| http://www.w3.org/ns/prov#value | - Biosphere 2 is a three-acre com-pound near Tucson, Arizona, built originally to test the feasibility ofbiologically self-sufficient human living units that might be involvedin extraterrestrial exploration. (The complex was named Biosphere 2in recognition of the earth itself as Biosphere 1.) One of the objectiveswas to raise all required food internally, to recycle solid, liquid, andgaseous waste p
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