Carl Sagan married three times:
1) the famous biologist, Lynn Margulis (mother of Dorion Sagan and Jeremy Sagan) in 1957
2) artist Linda Salzman (mother of Nick Sagan) in 1968
3) author Ann Druyan (mother of Sasha and Sam) in 1981, to whom he remained married until his death.
Isaac Asimov described Sagan as one of the only two people he ever met who were just plain smarter than Asimov himself.
The other was computer scientist and expert on artifical intelligence, Marvin Minsky.
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