Ideas By Dale Whelehan February 28, 2025 7:00 AM EST Whelehan is a social entrepreneur, behavior scientist, and Founder of 4 Day World. He is a 2024 TIME 100 Health Honoree and a lecturer at UCD Michael Smurfit Graduate Business School I magine walking through New York City, invisible. Marilyn Monroe , one of the most recognizable women in the world, once did exactly that. Without her platinum curls, breathy voice, and signature allure, she moved through the crowded streets unnoticed. Then, as