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★ Graffiti artists caught out by their handiwork Being hand-drawn, each piece is different, even when the same design is drawn by the same person, so Jain's system identifies key points in the design that remain more-or-less consistent. And since a gang's graffiti often incorporates its name or other identifying words, he uses crowdsourcing to identify those words, asking the human workers of Amazon's Mechanical Turk service to decipher any text in the images. When using both text and image features to assess a piece of graffiti, the system correctly names the gang or individual about 65 per cent of the time. Michael O'Grady, who researches graffiti detection at the University of Huddersfield, UK, says this means it is only really good enough for filtering images down to a manageable level for a human to examine. "I'd want it up around 85 per cent," he says. ★ The Poppers Story In the gay ghettos of the Seventies and early Eighties, poppers were always at the center of the