帮助波士顿马拉松组织者管理3万多名参赛者. Crowd scientists help Boston Marathon organizers manage 30,000+ participants.

一名群众科学家正在协助波士顿马拉松组织者管理越来越多的参赛者，目前超过3万人。 A crowd scientist is assisting the Boston Marathon organizers to manage an increasing number of participants, now exceeding 30,000.