That Biosphere bubble thingy

I was thrilled to read the street signs as I was leaving Tuscon, AZ, announcing my proximity to Biosphere 2.



I vaguely remember hearing about the eight scientists who voluntarily chose two years of confinement in this experiment that tested to see if life on the moon would work.



I got to sit at the table that the volunteers ate at, walk the boardwalks within the bubble, and feel and breathe the air inside the tropical and desert atmospheres.



One area simulated the ocean and its inhabitants, including conch shells. This huge shell sat in a sand box in the kid's area.

BTW, Biosphere 1 is Earth.