Today we learned that different cultures and and societies have different number systems: The most common numeral system nowadays is the decimal. It has 10 figures (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) and works on the base 10. We use a different system to measure time. Unlike the decimal system, is the this pattern based on 60 seconds in a minute, 60 minutes in an hour and 24 hours in a day. Other systems are still in use: Inch and feet for example and other systems which are based on 20.