The artist, who has worked with Banksy, began his career by "tagging" his name on buildings and trains around east London, examples of which are featured on his website under the heading "vandalism".
Two papers featured in the current issue of the prestigious American Journal of Epidemiology provide useful examples of how, simply because a study has been carried out, its findings can get held up as if they were meaningful, and the many considerations that should make us skeptical get short shrift.