Anonymous

They already do. Before particles existed time ran the other way... :-)

Anonymous

Time does not reverse. Only events may reverse, be periodic and thus are measured in time or periods of time.

Anonymous

Tachyons exist only in wild theories. If they existed (which they don't) we could observe them coming from the future into our present. Please see the link below for a list of many websites that discuss the ridiculous subject.

Anonymous

no such thing, as far as we know.

Anonymous

Keep looking, perhaps someday you will discover them.

Anonymous

If there are, I suspect we wouldn't be able to observe them because of the limited way we perceive time.

Anonymous

If you listen to a Hillary Clinton speech time will stand still. Or at least it will seem that way while she drones on.