Deminers spend much of their time locating and exposing scrap metal fragments. Statistics from Afghanistan show that 1000 sqm are cleared for every mine or UXO removed., where the average rate of metal fragments per unit area is one metal fragment per 3 sqm. (The range of metal framgents per area is 30 items per sqm to one fragment per 500 sqm - for approximately 500 minefields in soft ground conditions). [Modelling Minefield Clearance Performance, technical report available on request]. A magnet could remove ferrous/magnetic fragments before demining commences, reducing the time needed for manual demining.
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When Milwaukeeans do their business, it eventually ends up at the treatment plant. Something magical happens to all that poo - something involving this constantly belching stack - it becomes Milorganite(tm)! If you're a golfer, chances are good that Milwaukee's...