Researchers at Imperial College London have invented an electric surgical knife that comes equipped with a built-in mass spectrometer. Electric knives cauterize wounds as they cut, which produces smoke. The iKnife will be able to analyze the chemistry of that smoke to determine, for instance, whether the tissue that was just cut was cancerous or not — allowing doctors to make decisions in the OR that would, today, require them to take samples, send those samples to a lab, and maybe schedule a second surgery.