Ballistics Expert

摘要

Wiffle balls are very poorly behaved. They curve wildly, practically bouncing around in midair. No surprise, given the eight holes molded into one side. But to learn how the little plastic balls twist and spin through space, the go-to researcher is Jenn Ross-mann, a mechanical engineer at Lafayette College in Easton, Pennsylvania, who specializes in how fluids, especially blood, circulate. In 2003, she started thinking that