Cry from a Far Planet by Tom Godwin Science Fiction Adventure

<p><strong>A smile of friendship is a baring of the teeth. </strong>So is a snarl of menace.</p><p>It can be fatal to mistake the latter for the former. Harm an alien being only under circumstances of self-defense.</p><p>TRUST NO ALIEN BEING UNDER ANY CIRCUMSTANCES.</p><p>--From Exploration Ship's Handbook</p><p>The problem of separating the friends from the enemies was a major one in the conquest of space as many a dead spacer could have testified. A tough job when you could see an alien and judge appearances; far tougher when they were only whispers on the wind.</p>