Canadian footballer Ismaël Koné's use of the "green whistle" for pain relief during a World Cup match has sparked interest.

Canada midfielder Ismaël Koné drew attention during his FIFA World Cup match against Qatar after he was stretchered off the field while inhaling from a small green device known as the "Green Whistle." ...

A frightening injury during a FIFA World Cup match recently sparked widespread curiosity about an unusual medical device seen on the field. Canadian midfielder Ismael Kone was stretchered off after ...