Has anybody determined that the "gypsum needles" in the back of
Airman's are really selenite? The business about redissolving sounds
to me more like epsomite or mirabilite or some other humidity-
sensitive mineral. I think gypsum would have to be actually submerged
to dissolve, but maybe if the dirt they're growing on is wet, they
could be sucked back in, sort of the reverse of how they were
extruded.--Mixon
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