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NOVA
Ancient Earth: Birth of the Sky Preview
Early Earth was a hellscape of molten lava and barren rock, bombarded by meteors, with no atmosphere at all. How did our familiar blue sky – the thin, life-giving band of gasses protecting our planet – come to be?
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Amazing fossils reveal how mammals took over after an asteroid wiped out the dinosaurs.
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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.
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Follow engineers and woodworkers as they rebuild an iconic American covered bridge.
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Follow the harrowing operation to rescue 12 boys stranded in a flooded cave in Thailand.
