Quexistentials are words that can be used both as question words and as existential quantifiers. An example is the Dutch word wat, which can be used as a question word meaning what but also as an existential quantifier meaning something. Many languages around the world have quexistentials. Investigating the syntactic, semantic, and prosodic properties of these items is important in order to come to a better understanding of the exact commonalities and differences between questions and existential statements. Prof. Iatridou (MIT) has been collaborating with Roelofsen and Hengeveld (University of Amsterdam) since 2016 to address this issue. This has led to significant new insights, but a number of crucial questions remain open. Prof. Iatridous visit is intended to allow for a period of intense collaboration in order to resolve these and to finalise a substantial publication on the topic. Highlights of this project will also be made accessible to the general public through an article in the online popular science magazine Kennislink.