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1. AirGradient: DIY Air Quality Monitoring with Open-Source Hardware & Firmware (airgradient.com)
323 points by walterbell 33 days ago | 74 comments
2. Some SQL Tricks of an Application DBA (hakibenita.com)
327 points by samokhvalov 10 months ago | 68 comments
3. Show HN: Cookie Recipe Generator (thecookie.website)
137 points by dazsnow 11 months ago | 98 comments
4. Show HN: One Page Calendar 2020 (davebakker.io)
517 points by dbfa on Dec 31, 2019 | 98 comments
5. Ask HN: How Can I Learn Music Theory?
673 points by deanstag on Dec 18, 2019 | 239 comments
6. RegExr (regexr.com)
349 points by tosh on Aug 5, 2019 | 54 comments

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