There is now a new article called How Time Works that answers all of these questions about clocks and calendars, plus many more! You will be amazed, because we take all of this stuff completely for granted and the origins are amazing!
Who says you can't teach an old technology new tricks? Just because it was invented long ago, that doesn't mean it's useless today. Which programs are reinventing the wheel?
To some people, a crystal skull is simply a crystal in the shape of a human skull. But to those who believe in the supernatural, it can represent doom or hope.