Brain Facts: A Primer on the Brain and Nervous System
Society for Neuroscience · free, peer-reviewed primer
I’ve had this open since 8th grade. It’s the book I keep going back to whenever I need a clear baseline on something: resting potentials, neurotransmitters, sensory systems, neuroplasticity, brain disorders. Each chapter is short, sourced, and written for non-specialists. A lot of what later showed up in my HarvardX coursework I had already first met here.