@percept_1: You have 8,589,934,592 ancestors from just 1,000 years ago. That's more people than are alive today. So how is that possible? Back then there were only ~300 million people on Earth. The same people show up in your family tree again and again, until every branch folds back into one. Go back a few thousand years, and we're all related. 🧬 #genealogy #familytree #ancestry #datavisualization #mindblown