Register FREE for Zoom details: Think back to a really vivid memory. Got it? Now try to remember what you had for lunch three weeks ago. That second memory probably isn't as strong— but why not? Why do we remember some things, and not others? And why do memories eventually fade? Catharine Young gives the basics on memory and memory loss. [Directed by Patrick Smith, narrated by Pen-Pen Chen]. We watch a TED video together then break into small groups for facilitated discussions, usually we get through four questions and groups reshuffled for each question.