A basic pendulum is a mass at the end of a string that swings back and forth. It seems simple, and it appears in most introductory physics textbooks. But it's not a trivial problem to solve for ...

To that end, here is a wave pendulum. Enjoy 79 seconds of ... There's nothing like simple, rational, black-and-white physics to bring a sense of calm. Okay, now back to work.

You've probably seen the famous pendulum demonstration—the one where the physics professor puts a bowling ball on a rope, holds it by her head, and lets it go, knowing it won't have enough ...