چرا توپ های جام جهانی در هر تورنمنت بسیار عجیب به نظر می رسند

Why does the World Cup ball look so different year after year? It's a question we posed to John Eric Goff — a physics professor at University of Lynchburg and author of "Gold Medal Physics: The Science of Sports." Turns out, some of those changes haven't been for the best. And have caused more problems than they solved.