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This week on ‘TechKnow’

Cancer-sniffing dogs SATURDAY 7:30E/4:30P

Scientific trials show that dogs can detect cancer in samples of patients' breath—and new technology is trying to mimic that amazing ability.

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TechKnow is a weekly series that explores how the latest scientific discoveries are changing our lives. Our geeky contributors use their diverse backgrounds in science and technology to expose the controversies and celebrate innovative breakthroughs in the U.S. and around the world.