Lawrence M. Kraus on exploding stars.
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Lawrence M. Kraus on exploding stars.

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Stephen Hawking on predetermination.
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Stephen Hawking on predetermination.

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Neil deGrasse Tyson on alternative medicine.
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Neil deGrasse Tyson on alternative medicine.

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Carl Sagan quote from the book The Demon-Haunted World.

Carl Sagan quote from the book The Demon-Haunted World.