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NASA satellites have mapped Earth's gravity and discovered mysterious spots where gravity is weaker; how earthquakes change the planet's gravitational field.
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It's amazing to think that in the 1900s a mere tenth of the world's population lived and worked in cities. Now it is over half. With soaring populations, how will we keep our cities live-able? And what will the city of tomorrow look like?
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Antarctica is a mysterious and unexplored continent. Thanks to the Chilean Antarctic Institute and the research center Dynamics of Marine Ecosystems of High Latitudes, a group of scientists are suffering the extreme temperatures to study climate change and the earth's ocean currents.
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A look at how every one of the 20,000 islands was colonised by the Polynesians.
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This documentary explores how we've conquered the skies as we build astonishing places to live.
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On 26 April 1986, reactor number four at the Chernobyl Nuclear Power Plant blew up. Forty-eight hours later the entire area was evacuated. Over the following months there were stories of mass graves and dire warnings of thousands of deaths from radiation exposure.