"Here it is, boys." The mass of equipment that met their eyes vaguely resembled a medico's office x-ray gear. Beyond the obvious fact that it used electrical power, and that some of the dials were calibrated in familiar terms, a casual inspection gave no clue to its actual use.
"What's the principle, Doc?"
He stepped up to one of the reporters. "Suppose we take you as an example. Your name is Rogers, is it not? Very well, Rogers, you are a space-time event having duration four ways. You are not quite six feet tall, you are about twenty inches wide and perhaps ten inches thick. In time, there stretches behind you more of this space-time event, reaching to perhaps nineteen-sixteen, of which we see a cross-section here at right angles to the time axis, and as thick as the present. At the far end is a baby, smelling of sour milk and drooling its breakfast on its bib. At the other end lies, perhaps, an old man someplace in the nineteen-eighties.
"Imagine this space-time event that we call Rogers as a long pink worm, continuous through the years, one end in his mother's womb, and the other at the grave..."
"Now think of our long pink worm as a conductor of electricity. You have
heard, perhaps, of the fact that electrical engineers can, by certain
measurements, predict the exact location of a break in a trans-Atlantic
cable without ever leaving the shore. By applying my instruments to the
cross-section here in this room I can tell where the break occurs, that
is to say, when death takes place."
--Robert Heinlein (1907-1988) in "Life-Line" (1939)
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