thanks bittersweet.. My avatar is from Czech cartoon commercial.
French Revolutionary calendar was a way for the I. French Republic to break away from Christian calendar and was in place between 1793 till Napoleon changed it back. It was actually very popular by dividing day to ten hours, which were divided into 100 minutes which had 100 seconds. The drawback it had that week had ten days and people did not had enough time to rest.
I uses geometry all the time, as well as matrix algebra at my work. I love math, and if I had to choose a different career path, I will go for M.S. in applied mathematics.