Body language affects how others see us, but it may also change how we see ourselves. Social psychologist Amy Cuddy shows how “power posing” — standing in a posture of confidence, even when we don’t feel confident — can affect testosterone and cortisol levels in the brain, and might even have an impact on our chances for success. (Note: Some of the findings presented in this talk have been referenced in an ongoing debate among social scientists about robustness and reproducibility.)