Newton's Cradle

"Uhm, sir?"

"What is it, Johnson? Can't you see I'm busy?" Mr. Trollope stared intently at the Newton's cradle on his desk. "Amazing. Simply amazing. How does it do it, Johnson?"

"Conservation of momentum and energy, Mr. Trollope," answered Mr. Johnson.

"That sounds ridiculous. I prefer to think that the balls move back and forth by super magnets that change polarity with every click."

Johnson sighed, "That seems a bit overly complicated for such a simple device, don't you think?"

"I cannot see another possible explanation . . . other than magic," Mr. Trollope's eyes grew wide. "That's it! Magic!"

Mr. Johnson groaned loudly.