Mathematics and Primary Sources: In Search of the Perfect Calendar

Sometimes analyzing primary sources can help us reflect on commonplace aspects of our culture that we take for granted, illustrating how arbitrary they are, or how they change over time. John Collins’ 1939 “Proposed Utopian Calendar”, an attempt to reform the Gregorian calendar, provides an opportunity for students to practice historical, mathematical, and scientific reasoning to reflect on how humans have historically sought to organize our activities.

Mathematics and Primary Sources: Historic Codes, Ciphers, and Computational Thinking, Part II – the Women Codebreakers of WWII

Sending and cracking secret messages dates back to the foundation and exploration of the country. But did you know that much of the cryptographic work that helped the United States win World War II was accomplished by female codebreakers?

This Week in Office Hours: The American Archives of Public Broadcasting and Math with Primary Sources

Join Library of Congress education specialists every Tuesday and Thursday at 2pm ET for free online Office Hours for education. Each session will include a twenty-minute topical presentation with plenty of time for questions and answers with Library experts. Learn more at // May 19 Introduction to the American Archive of Public Broadcasting (AAPB) Join […]