A retired Japanese engineer memorized pi to over 111,000 digits using storytelling and visualization. The same year, he forgot his wife's birthday. Neuroscientist Lisa Genova uses this contradiction to challenge a widespread assumption: that everyday forgetting signals the onset of Alzheimer's disease. The video explores how memory actually functions, separating normal cognitive patterns from genuine pathological decline. Genova's approach centers on dispelling fear-based thinking around ordinary lapses, offering clarity on what constitutes normal aging versus warning signs that warrant medical attention.