Biosphere 2 hosted just two "sealed-in" crews, both during the 1990s.
This episode of Ungeniused is sponsored by:192: The Citicorp Center Engineering Crisis
191: Vantablack
190: Buc-ee's
189: Fainting Goats
188: Jazz Design
187: Long-term Nuclear Waste Warning Messages
186: The Mighty Spork
185: Three More Weird Sports
184: World Sauna Championships
183: McBarge and Expo 86
182: The 1961 Goldsboro B-52 Crash
181: Parking Chairs
180: The Baltic Sea Anomaly
179: The Videotape Format War
178: Twelve Drummers Drumming
177: Eleven Pipers Piping
176: Ten Lords A-leaping
175: Nine Ladies Dancing
174: Eight Maids A-Milking
173: Seven Swans A-swimming
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