What are the odds that visiting space aliens could simply walk off their craft and start breathing our own oxygen-rich atmosphere?
http://www.forbes.com/sites/brucedorminey/2012/11/20/why-e-t-would-also-breathe-oxygen/
What are the odds that visiting space aliens could simply walk off their craft and start breathing our own oxygen-rich atmosphere?
http://www.forbes.com/sites/brucedorminey/2012/11/20/why-e-t-would-also-breathe-oxygen/
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