"Uncle, have you ever heard of the Mobius Ribbon?" Louis asked as they were on their way to the next location.

Jeremy raised an eyebrow. "What's that?"

"You haven't heard it? The Mobius strip is a one-sided surface that has no boundaries."

Jeremy's eyes opened wider. His forehead was filled with more wrinkles.

"Uncle must be confused, Louis. We were also confused the first time we read it," Emily said lightly. Her face was already beaming again. While walking by Louis' side, her tiny ...