Mildly Interesting - I found this Hawaii-specific $10 bill from WWII | /r/mildlyinteresting
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Duga is a Soviet over-the-horizon radar station for an early detection system for launches of intercontinental ballistic missiles. | /r/mildlyinteresting
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Each roll of sanding paper is 150ft (45.7m) long but different diameter due to grit size: 80,120,220. | /r/mildlyinteresting
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