The way I understand it is that there is that probability, Mick, but the odds are very low of them actually hitting someone. I know that there were a few people killed during WW2 by spent anti-aircraft shells falling back to earth, but it was an amazingly small percentage compared to the size and amount of the ordnance expended.
I remember reading a story years ago about the safety door on an airliner's toilet giving way in mid-air, and the frozen contents then falling to the ground and just barely missing someone. That would sure have been a helluva way to go.
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