An analogue clock, a clock with hands, shows the numbers 1 through to 12. It is a 12-hour clock. The first 12 hours of the day, from midnight to midday, are called am. The next 12 hours ...

The number 12 is ubiquitous — it's the number of months in a year, hours on a clock face and the number of members on a typical court jury. And today, Dec. 12, 2012, corresponds to the date ...