Because NASA is no longer relevant, but desperately wants to be. So they publish anything, and anlways with a sensational headline: microbes that incorporate

Because NASA is no longer relevant, but desperately wants to be. So they publish anything, and anlways with a sensational headline: microbes that incorporate arsenic into biomolecules, reactionless microwave propulsion, and not fungal radiation shields. That line doesn't just seem ridiculous, it is.