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A British bus company uses sheep urine to reduce city smog. A chemical in the urine converts part of the fuel exhaust into nonpolluting nitrogen and steam.

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Amazing (200) America (274) Animal (433) Best (18) Engineering (13) English Language (23) Famous (20) Fun (34) Great (42) Highest (28) Human Body (2,500) Interesting (2,332) Largest (100) Least (24)

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