Time Machines?

In Cristina Escallon's blog entry Perspectives... I saw questions that I never really though about time traveling. Cristina said things like: How would it affect your present. Always when I think myself time traveling, its just and adventure. When I imagine time travel, I just think of a machine that can take me anywhere I want. Cristina's blog made me realize that time traveling other than being an adventure it affects your present and it might affect your future.

This book does not portray time traveling as most people portrays it. When reading Slaughter House-Five I started considering that time travel was not something good, like a privilege, but like bagage that Billy got stucked with. How Cristina says, why would you change your past if you are satisfied with your present? I think that if you get the option to change things that happened in the past you don't realize that by changing them you are also changing al your present. I think that that's why it is a bagage to be able to time travel.