Instant of Decision

How could a man tell the difference if all the reality of Earth turned out to be a cosmic hoax? Suppose it turned out that this was just a stage set for students of history?

Karnes handed it to him. "It has a couple of little sliding weights inside it. You have to turn the thing just right to unlock it, then it comes apart when you slide out a secti...

Was this the real Earth that he lived in, or a museum that had been set up by the Galactics? If it was old Earth, then man would solve his present problems and go on to solve th...