I'm having trouble uploading the presentation, but I suggest you download Martin Rees's address on "Life's Future in the Cosmos". Rees delivered this address to The Long Now Foundation, which seeks to "creatively foster long-term thinking in the framework of the next 10,000 years".
Rees's presentation is a mix of astronomy and speculative evolutionary biology, tied together with broad commentary on the place of humanity in the cosmos.
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