AUTHOR=Chang Huan-Tsung TITLE=Grand Challenges in Analytical Science JOURNAL=Frontiers in Analytical Science VOLUME=1 YEAR=2021 URL=https://www.frontiersin.org/journals/analytical-science/articles/10.3389/frans.2021.725070 DOI=10.3389/frans.2021.725070 ISSN=2673-9283