Cassini Map of France
First accurate national survey via triangulation
Episodes
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#3105: The Four-Hundred-Year-Old Pen That Outperforms Modern TechA 400-year-old tool still draws lines thinner than any modern technical pen can manage. -
#568: The Birth of the Border: How Countries Were InventedHow did we go from sprawling empires to rigid borders? Explore the history of the modern country, from Westphalia to the French Revolution.