Biosphere 2 hosted just two "sealed-in" crews, both during the 1990s.
This episode of Ungeniused is sponsored by:172: Six Geese A-laying
171: Five Golden Rings
170: Four Calling Birds
169: Three French Hens
168: Two Turtle Doves
167: A Partridge in a Pear Tree
166: The Twelve Days of Christmas
165: Scrub Daddy
164: The Howard Street Tunnel Fire
163: The Nottingham Cheese Riot
162: The Gateway Arch
161: Waterbeds
160: Dolly the Sheep
159: Paris Syndrome
158: Gummy Bears
157: The West Fertilizer Company Explosion
156: The Svalbard Global Seed Vault
155: Some More Non-Water Floods
154: The Agreement Governing the Activities of States on the Moon and Other Celestial Bodies, The Treaty on Principles Governing the Activities of States in the Exploration and Use of Outer Space Incl
153: The Demon Core
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