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This week, a speedy, yet simple switch, and a video-based AI helps assess heart health.In this episode:01:57 Speedy switchesResearchers have developed an ultra-fast electrical switch that they hope can be used in communication and imaging applications. Research Article: Nikoo et al.08:14 Research HighlightsUsing sound to estimate glacial retreat, and building a dodgier drone. Research Highlight: Underwater microphones listen as as glacier retreats; Research article: Falanga et al.10:32 Algorithmic heart diagnosisScientists have developed a new algorithm which calculates the amount of blood pumped by the heart beat by beat. Research Article: Ouyang et al.; News and Views: AI tracks a beating heart’s function over timeSubscribe to Nature Briefing, an unmissable daily round-up of science news, opinion and analysis free in your inbox every weekday.  See acast.com/privacy for privacy and opt-out information.