How to Make a Clock Run for 10,000 Years

High on a rocky ridge in the desert, nestled among the brush, is the topmost part of a clock that has been ticking for thousands of years. It looks out over the ruins of a spaceport, built by a rich man whose name was forgotten long ago. Most of the clock is deep inside the mountain, below the ridgeline. To get there, you hike for days through the heat; the only sounds are the buzzing of flies and the whisper of the occasional breeze. You climb up through the brush, then pass through a hidden door into the darkness and silence of the clock chamber. Far above your head, in the darkness, a massive pendulum swings slowly back and forth, making the clock tick once every 10 seconds.

via How to Make a Clock Run for 10,000 Years | Gadget Lab | Wired.com