Digression:
There was a seemingly benign paradigm shift when I worked in the US, but which was only more apparent after I returned -- in Australia one needs a
permit/permission to do many, seemingly innocuous things, whereas in the US it's allowed unless expressly restricted. This was many years ago and it
may have changed over there since then, although judging by the ease with which pyrotechnic precursors are available in the US it seems unlikely.
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