i'm a lecturer and researcher in the department of kinesiology. >> hi, i'm cristian ponce. i'm the student corresponder for "equal time". >> thank you all for being here today, and i thank you for doing this topic. because it's timely. it's important. you know, you look at research online, and you hear 30 million teenagers and young people involved in organized sports, yet 3.5 million injuries in those organized sports. so i'm naturally drawn to you felix. i want to ask you about your situation. you talked about having a concussion. what happened? >> well i -- i was in practice, and i got into a collision with one of the forwards on the other team. and yeah, he just knocked me out. i didn't feel much at first, and then after practice i felt a headache, and it didn't go away. so i thought i should just go check it out. and then, yeah, they diagnosed a concussion based on the symptoms i had. >> very good. now your doctor cleared you to go back and play again. and you're very comfortable with that as i understand it? >> yes. >> but you have other medical issues that you have t