Proteus Underworld, by Charles Sheffield
- ISBN: 9780671876593 | 0671876597
- Cover: Paperback
- Copyright: 5/1/1995
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In the 22nd century biofeedback techniques have enabled humans the ultimate expression--the ability to transform the body into any viable form. What began as an innocent technique to reduce anxiety without drugs has raised fundamental questions about what it is to be human. Enter the Humanity Test.