Think Wednesday | April 17, 2019 Preview
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On NATURE, join Sir David Attenborough as he explains how some birds evolved despite their inability to soar. Join NOVA for Secrets of Noah's Ark, and witness a new investigation of the Biblical flood story, leading to the reconstruction of an ark. On Breakthrough: The Ideas That Changed the World, look back in time to see how humans invented the telescope and used it to discover the universe.
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