The "Wisconsin Winter Stack Up" hosted some of the country's fastest cup stackers. Sport stacking is a competition in which competitors stack specially designed cups up and down in set patterns. Speed ...

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.

Christina Shi doesn't run short on talents. Ace student. Gifted musician. And, oh yes, the West Lafayette Junior High seventh-grader already is famous — for her cup-stacking skills. In 1.7 seconds, ...