Welcome to Crash Course World History Office Hours! John Green and Cathy Keller answer your questions on the Russian Revolution, discuss the origin of nation states, and talk about the best way to approach studying history. Thank you to Flipgrid for sponsoring this series. Check them out here: https://info.flipgrid.com/ 00:00 Introduction 06:02 Causes and effects of the Russian revolution 15:55 Who was Genghis Khan and how was he able to get so much territory? 20:56 How did the Cold War start? 28:17 Kwame Nkrumah and Ghana in African decolonization and the Cold War 31:03 The differences between the Aztecs, Incas, and Mayans 36:09 Ataturk and the origin of nation-states 41:05 What's the best way to look back on history? 44:05 Tips for studying World History 48:24 Why didn't the silk road stretch all the way across Europe? 50:53 Favorite books on history 56:16 Outro Crash Course Study Skills: https://www.youtube.com/watch?v=IhuwS5ZLwKY&list=PL8dPuuaLjXtNcAJRf3bE1IJU6nMfHj86W *** Wat

Plam's De Chez ByklyMay 13, 2026

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Welcome to Crash Course Office Hours! Alizé Carrère and April Luginbuhl Mather answer your questions on human and physical geography, including how rocks form, how melting glaciers impact water resources, and what even is geography? Thank you to Flipgrid for sponsoring this series. Check them out here: https://info.flipgrid.com/ 00:00 Introduction 01:48 What is geography? 02:43 Place, space, and location 04:28 Site, situation and scale 09:00 How do different types of rock form? 11:35 Reducing the impacts of earthquakes and volcanoes 13:37 How is a meander formed? 16:34 Origin and formation of fjords 18:52 How can mountain ecosystems be restore from the impact of development and tourism? 22:14 Impact of melting Himalayan glaciers on water resources 26:23 What is posthumanism? 31:30 Who are significant geographers? 34:05 Different types of boundaries 37:36 What are the markers of development? 40:26 What is in a geography course? 45:30 Tips for studying geography 48:35 Why do we person

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