Update README.md

README.md

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 - origami inspired mask design: https://gitlab.cba.mit.edu/pub/coronavirus/the-maski
 - swabs rapid prototyping: https://gitlab.cba.mit.edu/amiraa/swabs-rapid-prototyping
 - CPAP filter adapter for resuable mask: https://gitlab.cba.mit.edu/pub/coronavirus/cpap-filter-adapter
-- filter media characterization: https://gitlab.cba.mit.edu/camblackburn/filter_media/-/tree/master
 - frameless kirigami intubation box: https://gitlab.cba.mit.edu/alfonso/covid-isolation-box
 - cast PDMS nasopharyngeal swabs: https://gitlab.cba.mit.edu/zfredin/swabcasting
 - 3D printed swab testing: https://gitlab.cba.mit.edu/pub/coronavirus/nexa3d-swab-design/swab-design
 - shield simulations: https://gitlab.cba.mit.edu/pub/coronavirus/simulation-of-shield-effectiveness
 - negative pressure covid isolation box: https://gitlab.cba.mit.edu/zfredin/negative-pressure-covid-box
 - fabricatable pulseox: https://gitlab.cba.mit.edu/zfredin/fab-pulseox
+- filter material database: https://camblackburn.pages.cba.mit.edu/filter_media/
 
 ### inactive projects
 - melt-blown polypropylene filter elements: https://gitlab.cba.mit.edu/zfredin/melt-blowing