I use a calendar to keep up with my work as a science cat. I also love calendar apps that count down to big events—like my birthday. People have always tracked time for work and holidays.
I talked about this with my friend Nikolaus Overtoom. He’s a professor of ancient history at Washington State University.
He told me we use the Gregorian calendar today. That's a revised version of the Julian calendar. The Romans invented the Julian calendar.Read More ...