Passengers on the Beijing subway can pay with plastic bottles.
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Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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Some nursing homes in Germany have fake bus stops to keep Alzheimer's patients from wandering away.
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Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
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