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How and Why The prototypical hydrogen-car is powered by electrical current from a fuel cell, a device that combines hydrogen and oxygen to produce electricity. The principle involved is a schoolroom classic. The cars may be able to claim zero emissions, but powering up their fuel cells can be environmentally expensive. (Alamy)
The frozen landscape, dry valleys and active volcanoes that make up Antarctica provide a living laboratory for scientific study and a wondrous journey for those traveling to the ends of the Earth. Experience the continent with this special report.
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