This TED-Ed companion resource examines the science of concussions, subconcussive impacts, and long-term brain health. Students learn how brain injuries occur at the cellular level, why symptoms vary, and how repeated head impacts can lead to chronic conditions like CTE. The resource also addresses myths about concussions, recovery protocols, and the importance of reporting injuries. Includes 20 high school/college-level discussion questions, a clearly structured debate with labeled positions,