(via Atlas Obscura) Sailors and soldiers throughout history have relied on hardtack. These dry, compact crackers could survive long voyages and military campaigns without molding or disintegrating. Hardtack was such a feature of the Australian and New Zealand Army Corps (ANZAC ) diet that it earned the nickname ANZAC tile (or wafer.) But they didn’t just eat it: Some Australian soldiers wrote messages on the wafers and mailed them home.
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