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Jorge Covarrubias, a 17-year-old senior at Harvest Preparatory Academy in Yuma, Arizona, has developed a smart bandage designed to detect bacterial necrosis in saguaro cacti before the disease causes extensive damage. His project, called KaktosPatch, combines a biodegradable bandage with a smartphone application that interprets colour changes produced by the material.

Long before smartphones synced to the second, a government radio station in Colorado was already doing the job and still is. WWV, operated by the National Institute of Standards and Technology (NIST), has provided regular, round-the-clock shortwave time and frequency broadcasts since 1923, making it one of the longest-running government time-and-frequency radio services.