I saw a documentary on The Science Channel about time travel a year or two ago. They interviewed a guy who had an idea for a time travel device that was relatively simple in theory. Anyway it required a device at both ends of the journey. In short since no such devices existed in the past travel to the past was impossible, using his device anyway.
Time travel? Look at the photos from 150 years ago with lots of people in them. See the faces, imagine their struggles, pleasures, disappointments, all emotions possible. They are all DEAD now. Group of people today they are all going to be DEAD 150 years from now. People born 100 years from now they are going to be DEAD in 250 years. The point? I have none.