Sometimes, it's not the discovery that's hard—it's convincing others that you're right. Here Lauren Aguirre chronicles an investigation into a rare amnesia first identified in fentanyl overdose survivors. Battling indifference in the medical community, a handful of doctors were able to prove that opioids can damage the hippocampus, a brain region responsible for forming new memories. As Aguirre explains, this discovery may have implications for millions of people around the world, including a possible treatment for Alzheimer's Disease.