Special Report From N-Rays to EmDrives: When Does Science Become Pseudoscience? David Koepsell From: Volume 39, No. 6 November / December 2015 ShareTweet David Koepsell David Koepsell, a former executive director of the Council for Secular Humanism, is assistant professor of philosophy at the Delft University of Technology (faculty of Technology, Policy, and Management) in the Netherlands. See more articles This article is available to subscribers only. Subscribe now or log in to read this article.