With the safety of its players under increasing scrutiny, the NFL is offering $3 million in a "helmet challenge" competition.
원문출처 : https://www.cnn.com/2019/09/13/sport/nfl-helmet-challenge-3-million-prize-money-spt-intl/index.html
원문출처 : https://www.cnn.com/2019/09/13/sport/nfl-helmet-challenge-3-million-prize-money-spt-intl/index.html