You can do a lot of things with cups—and many of them don’t involve the drinking of beverages. Just ask Anna Kendrick. Perhaps one of the more unusual ways to use a cup is the sport of cup stacking, ...

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.