Credit... is the only enduring testimonial to man's confidence in man.

[clarification needed] With refinement the drive becomes a valid method of interstellar travel though not without mishap and adventure as other forms of travel are tried such as the near-useless (though fascinating and instructive for the quantum physicist) Arpe Drive ("Nor Iron Bars"). Since the device becomes more efficient when used to propel larger objects entire cities leave an Earth in decline and rove the stars looking for work among less-industrialized systems. A.

James Benjamin Blish (May 23 1921 – July 30 1975) was an American author of fantasy and science fiction.