Thanks for bumping my necropost, guys!
Okay, looks like we have simple solutions for all but the "nightime, low visibility" scenario. Any options besides the moss trick or magnetizing a needle?
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"Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave whither Thou goest." - Ecclesiastes 9:10
"If simple folk are free from care and fear, simple they will be, and we must be secret to keep them so." - JRRT
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