Most numbers used in business are based on 10 – commonly known as the decimal system. One dollar is $1.00 and a half-dollar is $0.50. Time, of course, is an exception because it's based on 12. The day ...

This decimal clock was made by Pierre Daniel Destigny in Rouen, France, between 1798 and 1805. | DeFacto, Wikimedia Commons // CC BY-SA 4.0 Everybody knows that there are 24 hours in a day, 60 minutes ...