Editor’s note: This segment was rebroadcast on Sept. 30, 2025. Click here for that audio. In the early 2000s, thousands of U.S. schools had their students race the clock to stack cups in gym class.

“The lighter the touch, the faster you are,” said cup-stacking expert Mark Lingle. He was at the Morgan Nazarene Church on Wednesday evening with a gym full of teenagers who were there to learn how to ...