Panel of experts says there is not enough evidence to give solid recommendations on many youth sports safety issues.
The telltale tau proteins present in the disease known as CTE display distinctive features.
Research suggests most North American college and professional hockey players don't specialize as youngsters.
Trainers have used Lasix for decades to reduce bleeding and improve performance in North American racehorses.
Research suggests that developing strength or aerobic fitness can improve long-term health. But is another method even better?