Players at the upcoming Women's Rugby World Cup will sport high-tech mouthguards that light up red when they suffer heavy head impacts, in a move aimed at improving player safety and reducing concussion, British media reported. The smart gumshields will send an alert to the match-day doctor warning of possible concussions during the August 22 to September 27 tournament in England, while referees will be advised to stop play upon seeing the red flash. The LED mouthguards are set to be