_It's a darned shame that just when we get past the experimental stage and learn how to have fun, the old body starts wearing out. Now what if there were spare parts for sale? What if you could get them installed on demand? A new heart, a new liver, a new--well, just suppose!_ [Transcriber's Note: This etext was produced from Fantastic October 1956. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.]…
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