The Human Zero

Comprising:

The Human Zero by Erle Stanley Gardner;
The Man Who Ploughed The Sea by Arthur C. Clarke;
The Proxy Head by Robert Bloch;
Hands Across Space by Chad Oliver;
Itself! by A.E. van Vogt;
The Imaginary by Isaac Asimov;
The Cosmic Relief by Eric Frank Russell;
I, Rocket by Ray Bradbury.