After this, doors had to be opened with all the caution of a tax collector coping with a mysterious parcel that ticks. - Wasp

Steve Ander sat and thought things over. It was his habit to think things over carefully. Astronauts were not the impulsive daredevils so dear to the stereopticon-loving public. They couldn’t afford to be. The hazards of the profession required an infinite capacity for cautious, contemplative thought. Five minutes’ consideration had prevented many a collapsed lung, many a leaky heart, many a fractured frame. Steve valued his skeleton. He wasn’t conceited about it and he’d no reason to believe it in any way superior to anyone else’s skeleton. But he’d had it a long time, found it quite satisfactory, and had an intense desire to keep it—intact.

Put out the light and there is stumbling in the dark.

Appearances aren’t always what they seem.