16岁少年Jack Andraka发明了一款用于探测爆炸物、环境污染甚至可检测癌症的手持设备(一种拉曼光谱仪)。普通的拉曼光谱仪大小和一辆小汽车差不多,售价接近10万美元。Andraka发明的设备只要15美元,只有手机这么大:
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