The 1939 World's Fair brought a special visitor from England: an original copy of Magna Carta, but with World War II in full swing, America couldn't send it back. So the had to babysit the priceless document, which got more complicated than they expected. ALSO Marie Curie's books will not be safe to touch for another 1500 years, so librarians in Paris have to keep people safe from the documents. Learn about Marie, her discoveries, and plenty more in this episode!