I love the concept of time travel. I feel like you are kidding yourself if you say you wouldn't like to go back in time even if it was just for a day. However I believe in the butterfly effect (Sound of Thunder anyone). Don't step on a butterfly it will change the future! Messing around with the past is an interesting idea to me. Maria is happy with her life and she doesn't want to be back in her 17 year old body. I would be terrified of losing my future with my husband and children. How can you get back without risking everything? That is the question!