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Invisible to the naked eye, yet a constant presence, microbes ('germs') live in, on and around us.

The researchers in this project collaborate with members of the public to explore and experiment on the microbial life in their kitchens (and in one instance - a cat) and starts to unpick what we really mean by 'clean' and 'dirty'.

This film is part of the Social Sciences: Bright Ideas series. You can watch more films and animations about Social Sciences research and impact at: www.socsci.ox.ac.uk/research/videos.