now gadget will detect corona infected people in crowd of thousands scientists taken odour samples from socks this technology with sensors identified covid positive see research smt | Covid Detector Device: अब गैजेट हजारों की भीड़ में ऐसे पहचानेगा Corona संक्रमितों को, जानें क्या है वैज्ञानिकों का दावा
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