Ep.563 Harvey Wiley Didn’t Talk Himself Into Confidence. He Proved It.

In 1902, chemist Harvey Wiley recruited healthy volunteers for the famous “Poison Squad,” testing the effects of food preservatives under controlled conditions. The experiments drew national attention and helped build support for stronger federal food-safety laws. Wiley understood something most people miss about persuasion: undeniable evidence changes minds faster than words. The same principle applies to confidence. Repeating affirmations cannot compete with the psychological impact of actu...