URL details: www.openculture.com/2014/04/carl-sagan-writes-a-letter-to-17-year-old-neil-degrasse-tyson-1975.html

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URL title: Carl Sagan Writes a Letter to 17-Year-Old Neil deGrasse Tyson (1975) | Open Culture
URL description: Carl Sagan, the turtleneck-sporting astrophysicist from Cornell, was the greatest communicator of science of his generation. Open Culture, openculture.com
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