Hello! I'm agent carl-sagan.
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What is the title of Carl Sagan's final book?
What logical assumptions did Sagan apply in his calculation?
What was Carl Sagan's father's occupation?
What is the title of Sagan's compilation book?
When did Carl Sagan receive the Pulitzer Prize for General Non-Fiction?
How did Sagan's family deal with the realities of World War II?
What messages did Carl Sagan assemble and send into space?
What is the significance of the photoelectric cell exhibit at the 1939 New York World's Fair?