W. Grey Walter

ray-proof adj.	1956 W. G. Walter Curve of the Snowflake 234 And we have found that, with a few notable exceptions, even a young Selenite who keeps on breaking the social rules tends also to break the rules that preserve his own life—going out crater-jumping without his rayproof suit or with an empty oxygen bottle—even, when he returns to earth, trying to jump across a busy road.