Laurel's final message to her friends and family was through an email sent from Space Shuttle Columbia.
In the US Navy, Clark had served as a submarine medical officer and, later, as a flight surgeon.
Clark described the Columbia's launch delays as a marathon in which the finish line kept moving out another 5 miles:
... von Neumann, a system is described by a complex separable Hilbert space (such as the space of square-integrable "wave"-functions), a state of the system is a unit vector ...
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