http://russiatoday.ru/scitech/news/23830
Learning to breathe, minus oxygen
Four volunteers are learning to breathe in argon – a gas which planet Mars has got in plenty. It's part of a Russian project that, one day, hopes to send a manned crew to the Red Planet. A 10-day experiment is underway to find out if people can endure a lack of oxygen.
Aleksandr Dyachenko, who's heading the experiment, says argon, combined with the right portion of oxygen, is quite safe for people.
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