Why do we always remember the worst things that happened to us and never the best? Excruciating memories of past mistakes have a tendency to haunt us, popping up uninvited to make us cringe and sweat the way good memories just don’t. Why? If every new experience creates new neural pathways in our brain, could we disconnect the ones we don’t want to revisit?  Neuroscientist Dr Dean Burnett joins Luke Turner to find out whether these toe-curling memories serve a biological purpose beyond basic survival. Every Monday and Thursday WHY? takes you on an adventure to the edge of knowledge, asking the questions that puzzle and perplex us, from the inner workings of the universe to the far reaches of our dreams. Follow on your favourite app so you never miss an episode. WHY? is written and presented by Luke Turner. Audio production by Jade Bailey. Artwork by James Parrett. Music by DJ Food. Exec Producer: Jacob Jarvis. Lead Producer: Anne-Marie Luff. Group Editor: Andrew Harrison. WHY? is a Podmasters Production. Instagram | Twitter Learn more about your ad choices. Visit podcastchoices.com/adchoices