Astrophysicist Ron Mallett believes he's figured out how to build a time machine that would allow someone to travel to the past.

As the narrator says, the laws of physics don’t explicitly forbid time travel, but that doesn’t mean we’ll be building a working time machine anytime soon that can let us whip back and forth ...

Maria Konnikova on the ability of humans to imagine the future and the possibility of time travel, and how it was affected by technology.

More by Paul Davies This article was originally published with the title “How to Build a Time Machine” in Scientific American Magazine Vol. 287 No. 3 (September 2002) ...

If I had a time machine I'd visit Marilyn Monroe in her prime or drop in on Galileo as he turned his telescope to the heavens. Perhaps I'd even travel to the end of the universe to find out how ...