Minnesota Vikings quarterback Teddy Bridgewater lies unconscious after sustaining a particularly nasty hit to the head during a game against the St. Louis Rams in 2015. The NFL reports there were 271 diagnosed concussions last year.
This is a partial view of the tennis center at Olympic Park in Rio de Janeiro. The International Olympic Committee is sending an advisory to participants in the 2016 Summer Games on how to deal with the mosquito-borne Zika virus.
Despite the allegation of sexual assault, former Florida State quarterback Jameis Winston continued playing football, won the Heisman trophy and was selected No. 1 in the 2015 NFL draft by the Tampa Bay Buccaneers.
New England Patriots' defensive end Chandler Jones holds a Microsoft Surface tablet on the sideline in the third quarter of the AFC Championship game against the Denver Broncos. In the second quarter, the Patriots' tablets briefly stopped working.
Christian Petersen/Getty Images