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In a future Basle, a city reshaped by an event known as the Great Flood, microscopic particles called tracers monitor the activities of the citizens, ably identifying criminals in the act. The second unusual new product is a family of molecular tracers for flexible and rigid packaging that add distinct chemical "signatures" to plastic products. During the runs, the scientists continuously fed a nonreactive tracer gas, sulfur hexafluoride, to the buses' exhaust systems. |
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