User blog comment:ProfessorMcG/Time Travel. Is it possible?/@comment-1988424-20100814231027

I read somewhere that time travel, is very possible. But we could only travel into times where there is already a time machine waiting to pick us up. Also, there are machines that can put humans into a sleep where they don't age at all (but you have to stay asleep the whole time and can't wake up on your own).