In this episode, Diego explores the curious history of the expression “knock on wood.” He traces its roots from ancient nature rituals to modern English usage, showing how this superstition reflects a universal human desire for luck, protection, and comfort. Along the way, listeners learn vocabulary like ritual, gesture, tradition, comfort, and unpredictable, while discovering how similar habits appear across cultures. Blending psychology and storytelling, the episode invites reflection on why we believe — and how small traditions connect us all.