Pressure in the biosphere

Wired has a short interview with Jane Poynter, who was one of the 7 people who locked themselves up in Biosphere 2 in the 1990's.

Apparently they stayed there for nearly 2 years, which is longer than I recall. I don't remember this aspect of the experiment getting much publicity:

Throughout their stay, short tempers, depression and even the specter of insanity kept life interesting for the "biospherians." In her new book, The Human Experiment: Two Years and Twenty Minutes Inside Biosphere 2, Poynter gives an insider's view of the famous experiment.

It might be a fun read, just to hear about the psychological effects.