Eventually, rudimentary reconnaissance began with the help of a miniature plastic tank bought by one of the scientists for 12 rubles (the equivalent, then, of $5) from the toy store Detsky Mir—Children’s World—in Kiev. The toy was controlled by a battery-operated box on the end of a long cable and modified to carry a dosimeter, a thermometer, and a powerful flashlight. The scientists used it like a radiosensitive hunting dog which ran ten meters ahead of them and warned of imminent danger. Although fully aware of the perils surrounding them, the members of the Kurchatov task force were urged
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