Today, you’ll learn about a new discovery that turns our understanding of hunter-gatherer diets on its head, the effect of self-checkout on our sense of loyalty to grocery stores, and some good news about the majestic emperor penguin.     Hunter-Gatherer Diets    “Hunter-gatherers were mostly gatherers, says archaeologist.” by Hannah Devlin. 2024.  “Paleo diet: What is it and why is it so popular?” by Mayo Clinic Staff. 2022.  “What Paleo diets get wrong: We’re not evolved for meat, and our ancestors ate carbs.” by Julia Belluz. 2015.    Self-Checkouts    “Does Self-Checkout Impact Grocery Store Loyalty?” Drexel News. 2024.  “Must-Know Self Checkout Statistics [Latest Report].” by Lorena Castillo. 2023.  “Self-checkout now comprises nearly 40% of grocery checkout options, study says.” by Catherine Douglas Moran. 2022.  “Feeling rewarded and entitled to be served: Understanding the influence of self- versus regular checkout on customer loyalty.” by Farhana Nusrat & Yanliu Huang. 2024.  Penguin Colonies    “Scientists Discover Four New Emperor Penguin Colonies From Satellite Images of Antarctica.” by Sarah Kuta. 2024.  “Top 10 Facts About Emperor Penguins.” WWF. 2023.   Follow Curiosity Daily on your favorite podcast app to get smarter with Calli and Nate — for free! Still curious? Get exclusive science shows, nature documentaries, and more real-life entertainment on discovery+! Go to https://discoveryplus.com/curiosity to start your 7-day free trial. discovery+ is currently only available for US subscribers.  Hosted on Acast. See acast.com/privacy for more information.