Inspired by a series of unexplainable events, this interactive book documents a multi-year investigation into science and philosophy. Part inquiry and part memoir, What's the Matter is the story of how a search for answers about physical reality ended up transforming it, culminating with an unexpected insight about emotions in the midst of deep-seated fear. – Our Puzzling Universe, the expanded science version, is included free. Last updated: December 29, 2025 © 2025 Nichole McCall