The Mongol Zoominar Presents: Knowledge and Empire , with: Jinsong Guo (Peking University) Measuring the Greatest Empire: Qubilai Khan's Astro-Geodetic Survey Yoichi Isahaya (Hokkaido University) Knowledge-Integration vs. Knowledge-Conversion: The Mongols' Imperial Attitude toward Sciences Tunç Şen (Columbia University) The Extent of Imperial Need for Scientific Expertise: The Business of Astrologers at the Early Modern Ottoman Court Organizer and Moderator: Qiao Yang (Max Planck Institute for the History of Science)