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NOVA
What Are UFOs?
Season 52
Episode 1
After decades in the shadows, UFOs are being studied seriously. Are they weather balloons, optical illusions, secret military technology? Or something else? Follow scientists as they try to unravel the mystery of the strangest objects in our skies.
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Giant fossils uncovered in the Sahara Desert reveal new secrets of how whales evolved.
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53:30
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53:20
The inside story of China’s meteoric rise to the forefront of global innovation.
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53:15
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53:45
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53:47
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