Time Travel a la Stephen Hawking

[Darwinian]

If time travel was possible then it poses the question, where are all the tourists from the future? The normal answer to this is of course that it may be that in order to travel back to the past then you must have already created a time machine to travel back to. Again, the problem with this is that as soon as you switch your machine on for the first time you would be inundated with countless visitors from all different periods of the future wanting to be the 'first' to travel back to the beginning of time travel.

Anyway, I could go on for hours about the problems and solutions of time travel but it's late and I can't be bothered :S

If I could time travel, assuming that I couldn't change the past as this would either create a new time line or catapult me into one of the infinite universes as described by the many worlds theory, I would go back to last Saturday, before 8 p.m. and buy a lottery ticket having first noted down last Saturdays winning numbers...