(CBS) - The "pendulum wave effect" is a well-documented phenomenon that has been demonstrated in numerous classrooms around the world... but have you ever watched it with a black light and music?

The pendulum has swung back and forth, but the net effect has been toward -- to use Steven Pinker’s term -- the better angels of our nature. When talking about the Pendulum Effect, we also have ...

When two identical pendulum clocks are mounted next to each other on a wall, their swings eventually become synchronized, swinging in opposite directions. He called the effect "an odd kind of ...