For decades, the idea that your language shapes your thought (the Sapir-Whorf hypothesis) was academic poison, blamed on sloppy anecdotes about Hopi verb tenses. Then a generation of cognitive scientists, Lera Boroditsky chief among them, built careful experiments and found real, measurable effects: how you talk about space, time, color, and blame changes what you notice and remember. This course covers the fall, the rehabilitation, and what actually survived peer review.