 What did David determine the black box was for?
[Transcriber's Note: This etext was produced from Planet Stories November 1952. Over the mesh-covered speaker, two knobs glowed red. The mesh-covered hole and the two lights looked like a caricature of a face, set in a panel of dials. Now it must tell me why I didn't. The first swung back to reveal a deep closet holding five bulky suits. He was as still as death, motionless without warmth or breath as I hovered over him. It waited for human hands to make it operate. This room was filled with equipment that formed a room out of the bordered area I stood in. They stood for anything I might guess, and something kept pricking my mind, telling me I had no time to guess.
 A device to deliver medication
 Storage of canned food  A navigation device  A device to deliver medication  Testing equipment