More than 35,000 college athletes and cadets at U.S. service academies are helping researchers write a new, extensive and groundbreaking chapter in the study and tracking of concussions.With about $22 million in funding from the NCAA and Department of Defense, the college students have agreed to be monitored over a period of years, even decades, to determine the frequency, severity and cumulative effects of head injuries in their respective activities.Though the project, run by a group of investigators who make up the …