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?