AUTHOR=Davis Ernest TITLE=Unanswerable Questions About Images and Texts JOURNAL=Frontiers in Artificial Intelligence VOLUME=Volume 3 - 2020 YEAR=2020 URL=https://www.frontiersin.org/journals/artificial-intelligence/articles/10.3389/frai.2020.00051 DOI=10.3389/frai.2020.00051 ISSN=2624-8212 ABSTRACT=Questions about a text or an image that cannot be answered raise distinctive issues for an AI. This note discusses the problem of unanswerable questions in VQA (visual question answering), in QA (visual question answering), and in AI generally.