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1. Air-to-Air Heat Exchangers for Healthier Energy-Efficient Homes (ndsu.edu) 272 points by MengerSponge on Feb 4, 2023 | past | 180 comments 2. The Secret World of Russia's Cold War Mapmakers (wired.com) 4 points by MengerSponge on Feb 20, 2021 | past | 1 comment

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