The US Army Soldier Systems Center has developed a new way of reconstituting dried food on the battlefield: just add dirty water or urine. The food is protected from bacteria and most toxic chemicals by an osmotic membrane that allows only water and other tiny molecules to pass whilst keeping bacteria, viruses, and particulate matter out.
The membrane is not, however, fine enough to filter out urea, which is present in urine and can cause kidney damage if ingested over long periods of time. Fortunately for soldiers’ stomachs and psyches, urine is suggested as an emergency-only reconstitution measure.
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