For most of history, human progress was slow and life was more or less the same from generation to generation. But over the last thousand years, we’ve seen giant shifts in basically everything! Study Hall’s new Modern World History series will explore the catalyst events, from imperialism to iPhones, that led to the global society we are today. New episodes every Thursday on the @GoStudyHall channel! | CrashCourse

Did you know that roughly 55% of the history of life on Earth was constituted by tiny, single-cell organisms called prokaryotes? | OER Project