A Grand Experiment

Biosphere 2 veteran Mark Nelson recounts the challenges of living inside a sealed environment with an eight-person crew in an excerpt from his new book, Pushing Our Limits: Insights from Biosphere 2.Mark Nelson, one of the eight crew members locked in Biosphere 2 during its first closure experiment, offers a compelling insider's view of the dramatic story behind the mini-world in his forthcoming book Pushing Our Limits: Insights from Biosphere 2 (University of Arizona Press). Nelson clears up co