A single rogue letter of DNA code changed Linde Jacobs’s and her family’s life forever. Passing from her grandmother, to her mother, to her and her sisters is the MAPT gene that causes frontotemporal dementia. Seeing the decline of her mother and grandmother was enough to hurl Jacobs’s life into a flurry of scientific conventions and research to prevent other families from having to go through what she did. Her inspirational story embodies what it means to take action for the good of others.