Presentation slides for a talk given on Taiwan's citizen science facemask mapping platform and its collaboration with the Taiwanese government during the COVID-19 pandemic. This example demonstrates citizen science as a form of participatory democracy that directly influenced government policy, while a dedication to open science principles with open source licensing of all material allowed creative solutions to flourish. This was part of Taiwan's wider aggressive response to COVID-19 that resulted in zero confirmed locally transmitted cases since April 2020 until the time of this talk in September. The citizen science network behind the mapping platform is g0v (pronounced "gov zero"): https://g0v.asia/ Many thanks to Hung-Ying Chen for valuable insights and comments during the development of this talk. The presentation file (Hsing citizen science open science 2020-09-11.pptx) was saved by Microsoft PowerPoint 2019 build 13127.20296 on Windows 10 in the Office Open XML Strict format. The file includes embedded narration (AAC encoding) and automatic slide timings. The fonts Metropolitano (https://fontlibrary.org/en/font/metropolitano) and Source Code Pro (https://en.wikipedia.org/wiki/Source_Code_Pro) are also embedded, both released under the SIL Open Font License. A text transcript of this talk is in the file Hsing citizen science open science 2020-09-11 transcript.txt. All files are shared under the Creative Commons Attribution-ShareAlike 4.0 International license unless otherwised noted.