In honor of Leap Day, this read is for the history nerds. Ever wonder how America caught our calendar up with the rest of the world? In September 1752, we skipped 11 days. According to NASA, the Earth ...

Lunar New Year began Saturday February 10. But have you ever stopped to wonder why it's celebrated at this time or where the current Chinese calendar comes from? Space historian Osnat Katz Moon says ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...