Yes. The question of CO2 and the difficulty reconciling Satish with practically all other CO2 studies has been a question of interest to ggreer & me since it was first raised on LW years ago: http://lesswrong.com/r/discussion/lw/nk0/what_is_up_with_car...
Was just reading that through and idly wondering, if that was the only experiment getting such a result, and there is nothing obviously wrong with the methodology, was there anything else by accident in the tank or gas lines they used for the CO2?
Not the first explanation I would reach for. (What would have to be in those tanks? Nitrogen would be very noticeable and wouldn't do anything, oxygen would presumably help rather than harm, and so on.)
