Ron Mallett, PhD suggests that time travel is possible and aspires to create a working time machine in the next ten years. He supports his ideas with a lot of factual evidence and theories, but I am not sure of the reality of it all. He uses Einstein's theories of relativity and motion to substantiate his ideas. Here is an interview on the subject matter...

http://bit.ly/ec73hW

What do you think about his ideas? Or about time travel in general?