In this episode, Xavier Bonilla has a dialogue with Tamim Ansary about a global history of humans through time. They discuss the main theme of interconnectedness, language, symbols, and culture, origins and nomadic peoples, early trading, rise of city states, religion and belief systems, the Crusades, Mongol Empire, Ottoman Empire, colonialism, empires and nation states, and many more topics.

Tamim Ansary is the author of many books, including Destiny Disrupted and The Invention of Yesterday. He has published essays and commentary in the San Francisco Chronicle, Salon, the Los Angeles Times, and more. Born in Afghanistan in 1948, he moved to the US in 1964. He lives in San Francisco.

In this episode, Xavier Bonilla has a dialogue with Davis Samson on the evolution of sleep. They discuss various sleep misconceptions, why we need sleep, stages of sleep, and the physiological and social aspects of sleep. They also talk about the evolution of circadian rhythms, napping, evolutionary differences, dreams, paleo sleep, and many more topics.

David R. Samson is associate professor of evolutionary anthropology at the University of Toronto and the author of Our Tribal Future: How to Channel Our Foundational Human Instincts into a Force for Good. His pioneering research has been featured in National Geographic, Time, and The New York Times and on NPR and the BBC. He is the author of the latest book, The Sleepless Ape: The story of sleep in human evolution.

In this episode, Xavier Bonilla has a dialogue with Katja Hoyer about the Weimar Republic. They give an overview of the Weimar Republic, voting and role of economics, major figures, how Hitler won his election, Nazi rule under Weimar Republic, negative views against Jews, Weimar after World War II, and many more topics.

Katja Hoyer is a historian and journalist who is visiting research fellow at King’s College London and a Fellow of the Royal Historical Society. She is also Global Opinions contributing columnist for The Washington Post. Her main research area is the history of modern Germany. She is the author of Blood and Iron: The Rise and Fall of the German Empire 1871-1918 , Beyond the Wall: A History of East Germany , and the most recent book, Weimar: Life on the edge of catastrophe.