A astronaut cover signed by Neil Armstrong. via collectspace.com hide caption

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Planet Money

What The Apollo Astronauts Did For Life Insurance

Before Neil Armstrong walked on the moon, he had to solve a more prosaic problem.

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Armstrong stepped into history July 20, 1969, leaving the first human footprint on the surface of the moon. NASA/Getty Images hide caption

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A tenuous thread of dark matter is seen connecting the galaxy clusters Abell 222 and 223. Courtesy Jörg Dietrich/Universitäts-Sternwarte München hide caption

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