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NOVA
What Happened to the Hole in the Ozone Layer?
The extreme thinning of the Ozone layer threatened to bring on a global crisis from destroying plants and ecosystems to sky-high skin cancer rates. So, what happened?
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Paleontologist Kirk Johnson explores the dynamic history—and future—of ice at the poles.
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Discover the science behind Leonardo da Vinci's masterpieces—and Mona Lisa's iconic smile.
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Amazing fossils reveal how mammals took over after an asteroid wiped out the dinosaurs.
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Discover why scientists and entrepreneurs alike have their sights set on the Moon again.
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53:23
New archeological evidence shows the stunning engineering of the Great Pyramid of Giza.
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Join scientists as they grab light from across the universe to prove quantum entanglement.