Our weapons of war are so effective they can kill you after sitting for nearly 100 years.I bet many unexplored bombs are ones that had been set with a delay fuse that failed to to trip.
At least in Europe there are laws that require the search of UXOs before any digging or construction is done in third world countries they have almost nothing.
I was reading some place that in Laos little kids try to find the bomblets from the many cluster bombs that where dropped over Laos in the 60's and early 70's.The reason they look for the bomb lets is because they want the ball bearings to use with sling shots and they make toys out of the metal.They lack the education to I guess to understand not to mess with the bomblets.To be fair they also mind a large number of un exploded RPG and B-40 rockets in Laos so the Communists are as harmful as the Capitalists.I understand that the cluster bombs used by the US Air Force back then had about an 80% functionality rating.That still means a lot of bomblets laying around there must be 100~150 in each canister.
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