A worker tests the RETIA Through-Wall imaging system (ReTWis) at a plant in Pardubice, Czech Republic, November 25, 2015. According to a press release, the ReTWis is a portable radar that can detect and display the exact position of living beings from behind walls or under rubble, as well as track their movements in real time and even capture micro-movements such as breathing. (Photo by David W. Cerny/Reuters)
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