10,000-year clock http://www.wired.com/gadgetlab/2011/06/10000-year-clock/all/ (www.wired.com)

I know this story is a couple years old but I am just finding it.

The thing about this clock that raises the hair on the back of my neck is the potential for some future archaeologist or paleontologist (terrestrial or extraterrestrial) finding this clock, examining it, and discovering that, yes, it ran for 10,000 years (or even longer) and has stopped working at some point.