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. Pre-release: August 17, 2025 Full release: October 24, 2025 Last updated: November 1, 2025 © 2025 Nichole McCall