Biosphere 2 hosted just two "sealed-in" crews, both during the 1990s.
This episode of Ungeniused is sponsored by:72: The Future of Earth
71: Animals with Fraudulent Diplomas & The Work of F. D. C. Willard
70: The National Geographic Society
69: Times Square Ball
68: Hermitage Cats & The Chief Mouser
67: The Great Canadian Maple Syrup Heist
66: Pneumatic Tube Mail in New York City
65: The Raising of Chicago
64: Chemtrails
63: Challenge Coins
62: The 11 foot 8 Bridge
61: The Coca-Cola Company
60: The Cola Wars and New Coke
59: Draft of Common Misconceptions
58: Hans Island
57: Left vs. Right-Hand Traffic
56: Glasgow Ice Cream Wars
55: Food Trucks and Ice Cream Vans
54: Jack the Ripper
53: Serial Killers
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