The goal of sport stacking, or “Speed Stacks,” is to stack and unstack a set of 12 plastic cups as quickly as possible in a predetermined pattern. The activity develops hand-eye coordination, ...

(updated at 1 p.m. to correctly name the school Thomas attends) Watching Ethan Thomas move is like watching a movie in fast-forward. The 10-year old is a speed stacker. That means for two hours a day ...