Time Machine.?

Question

If you invented a time machine would you be able to travel backwards in time to before you invented the machine?

Answer 1

Sure, that's how I know I'll never invent a time machine.  I would have come back by now to give myself a sports almanac like Biff in back to the future II.

Answer 2

I think you would end up messing yourself up real bad doing that....    you should ask Dr. Emmit Brown to be sure though.

Answer 3

Interesting.  I would think so, but then if you changed history and made it so you didn't invent it but someone else did, then your machine would disappear, right?  Too complex to know for sure, really.