Part of the reason NASA was trying to keep the stuff is because we weren’t sure at the time what was in the “moon dust.”
The first thing they did was isolate the crew and go over them fine toothed for three weeks to make sure they were not carrying something we had no idea what it was from the moon. So introducing dust into the civilian world was like giving it the bird flu. It might have killed millions.
rwood
Of course over countless years meteor hits on the moon had been blasting moon dust into earth’s atmosphere.
It’s a sterile ball, no more harmful than most earth dust.
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