Download or read book Proteus in the Underworld written by Charles Sheffield and published by Baen Books. This book was released on 1995 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.