A fantasy writer is visited by aliens who wish him to teach them human emotions so that they can observe humans undetected. He is afraid if they learn the history of people, they will destroy civilization so that space travel does not threaten them. The last two emotions he teaches them are ambition and power, hoping that they will destroy themselves.; An East German plots to murder his business partner and then get help from an Allied soldier stationed just across the border, but the soldier is actually a statue and does not respond to his plea.; A man takes a bet to spend the night in a haunted house and ends up the ghost which haunts the house.; Martian gun-runners arm select humans with advanced weaponry hoping that they will battle amongst themselves and leave them as easy pickings for an invasion force.