Medieval woman painters, houseplants eat pollution, viruses that kill superbugs, Antarctica turns researchers into zombies, fresh water is getting saltier and which planets are we missing?

Quirks and Quarks

Blue pigment found on a medieval woman's teeth suggests she was a skilled, literate artist; A genetically modified houseplant could suck up dangerous indoor air pollution; Viruses that kill superbugs could save lives when antibiotics don't work; Zombies in Antarctica - Isolated researchers enter 'psychological hibernation'; We're making our fresh water salty by massively changing the landscape; For every exoplanet we see transiting a star, how many go unseen?

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