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Sniffer dogs are a familiar sight at airports all over the world, where border agents use them to detect illegal substances and contraband. But in Finland, they're training them to sniff out the coronavirus. It's a pilot project being run at Helsinki airport. The project leader, Anna Hielm-Bj枚rkman of the University of Helsinki, explains what kind of dogs are suitable.

(Photo: Two of the dogs undergoing training at Helsinki Airport.
Credit: Getty Images)