The Pendulum

Over at sl-LOST.com, they have some info about the pendulum we saw at the end of "The Lie." It's called a Foucault Pendulum, and is used to track the rotation of Earth. They also have a YouTube video of one in action along with their explanation. The video, to be honest, is kind of boring, and that's a science teacher telling you that, but feel free to check it out if you're curious.

Foucault Pendulum article at sl-LOST.com