Tipler published a paper on how to build a time machine, a Tipler Cylinder, back in 1974. This machine would enable you to travel back in time.

Prof Mallett has wanted to build a time machine for most of his life. His passion, he explains, can be traced to a tragic event early in his life.

When Ronald L. Mallett, a retired theoretical physics professor, was 11 years old, he read H.G. Wells’ famous classic, The Time Machine, a book that he said changed his life. He decided he would ...

Mallett's time machine went public in 2001, when New Scientist magazine ran an article about his design, and TV appearances followed. "Mallett isn't mad," the New Scientist article said.

He hopes to use his equation and his theory to build a time machine that yes, would allow him to see his father again. He has raised $250,000 for the first phase of his experiments, which are ...