Answer
Chronic traumatic encephalopathy (CTE) is a degenerative brain disease found in Seau's brain after his death. It's a progressive condition caused by repeated head trauma, often seen in athletes who've experienced multiple concussions. CTE can lead to memory loss, impaired judgment, aggression, and depression, and has no known cure. Understanding CTE has raised awareness about the risks of head injuries in sports and the importance of concussion management.