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Lifeline by Robert Heinlein:
Science Fiction Inventions, Technology and Ideas
“A new author suggests a means of determining the day a man must die — a startling plausible method.”
Lifeline is Robert Heinlein's first published story, appearing in Astounding Science Fiction in 1939. He wrote the story in response to a contest in Thrilling Wonder Stories for a $50 prize, but submitted it to Astounding and was paid $70.

('Lifeline' by Robert Heinlein)
Dr. Hugo Pinero has a machine, a "chronovitameter", that allows him to accurately predict the date of a person's death. As you might imagine, this has a profound impact on the insurance industry. Select
an invention:
Technovelgy.com is devoted
to the creative inventions of science fiction authors and movie makers. Look
for the Science Fiction Invention Category that
interests you, the Glossary of Science Fiction
Inventions, the Timeline of Science Fiction
Inventions, or see what's New.
Find new authors and technologies - Shop for yourself,
your library and your lab.
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