Because a pendulum's oscillation frequency depends on its length, not its mass, you can use different colored bowling balls for a pretty effect. By Francie Diep Published Sep 8, 2014 7:20 PM EDT ...

Donation Options Search Search Search David Olson kept digging up more bowling balls as he worked on replacing his outside stairs at his home near Muskegon, Mich. Turns out that workers at a ...