> "something as simple as keeping time" Keeping time has been a difficult problem for... well, as long as we've tried keeping time. For an interesting historic

> "something as simple as keeping time" Keeping time has been a difficult problem for... well, as long as we've tried keeping time. For an interesting historical account on past difficulties, you might check out the book "Longitude" [1]. [1] http://www.amazon.com/Longitude-Genius-Greatest-Scientific-Problem/dp/080271529X http://www.amazon.com/Longitude-Genius-Greatest-Scientific-P...