At the top of one of the most significant pages of his notebooks, Charles Darwin wrote “I think.” There are three good reasons to explain why he might have done so. Get in touch: podcast@gretchenrubin.com Follow on social media: @GretchenRubin on YouTube @GretchenRubin on TikTok @GretchenRubin on Instagram @GretchenRubin on Threads Get the podcast show notes by email every week: happiercast.com/shownotes Get Gretchen Rubin’s newest book Life in Five Senses to see how she discovered a surprising path to a life of more energy, creativity, luck, and love: by tuning in to the five senses. Now available - order here. Visit Gretchen's website to learn more about Gretchen's best-selling books, products from The Happiness Project Collection, and the Happier app.  Happier with Gretchen Rubin is part of ‘The Onward Project,’ a family of podcasts brought together by Gretchen Rubin—all about how to make your life better. Check out the other Onward Project podcasts— Side Hustle School, Happier in Hollywood and Everything Happens with Kate Bowler. To learn more about listener data and our privacy practices visit: https://www.audacyinc.com/privacy-policy Learn more about your ad choices. Visit https://podcastchoices.com/adchoices