Brendan sits down with Dr. Priya Natarajan. Dr. Natarajan is a theoretical astrophysicist interested in cosmology, gravitational lensing and black hole physics. In particular, she has focused on making dark matter maps of clusters of galaxies, the largest known repositories of dark matter. Priya recently authored the book Mapping the Heavens: The Radical Scientific Ideas That Reveal the Cosmos. She is also on the scientific advisory board of Nova ScienceNow.