Stephen Hawking

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Black Holes: The Edge of All We Know
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Black Holes: The Edge of All We Know

Black holes stand at the limit of what we can know. To explore that edge of knowledge, the Event Horizon Telescope links observatories across the ...
The 11th Hour
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The 11th Hour

Aug. 17, 2007

The 11th Hour

A look at the state of the global environment including visionary and practical solutions for restoring the planet’s ecosystems. Featuring ...