The Weirdest Thing I Learned This Week hits Apple, Spotify, YouTube, and everywhere else you listen to podcasts every-other Wednesday morning. In parts of Russia, there are so many old manuscripts preserved on birch bark that there’s basically a field of study devoted to them. But the most famous of these birch bark writings come from a single prolific artist who lived there in the 13th century. Onfim’s birch bark scraps show signs of schoolwork, with psalms and cyrillic alphabet exercises written out on many of them. To learn more about Onfim’s adventures (and doodles), listen to this week’s episode of The Weirdest Thing I Learned This Week.