false positive and negative results may occur. ask your provider for cologuard. (group) i did it my way! o donnell: the butterfly effect is the idea that even a small event, like the flap of a butterfly s wings, can cause widespread change. tonight, we meet one young woman who made a big impact, despite her beautiful life being cut short and how her love of butterflies inspired her family and friends to honor her memory. i m walking on sunshine. reporter: penny doerge lived every day with joy, humor, and bravery. she made a choice to live her life with joy and optimism. reporter: at a young age she was diagnosedh neurofibromas,causrsd o rminal n canclong time. and never knew thaty med iswith