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Bird Brains
Name that tune! Try matching eight songs and calls to the right birds, and learn more about how and why they sing.
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Space Storms
See a gallery of the dazzling Northern Lights and hear their eerie sounds.
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Profile: Yoky Matsuoka
How did a self-described "airhead" come to embrace her inner scientist?
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Smart Bridges
Find out what caused eight infamous bridge collapses.
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Episode links
