# @ Friday, November 26, 2004 4:22 PM

None. If space and time are the same thing. In theory, if you create a time machine, you can take it back to a time before it was built. Thus you can give it to yourself before it's built, meaning you would never actually have to build it, since you would already have it. And if space / time are the same, then since it is omnipresent in time, it can also be omnipresent in space, meaning you can then give a time machine to everyone in the worrld, but they would actually be the same machine. See the last hitchhikers book for a better explanantion of this.

RadioImp

# @ Friday, November 26, 2004 10:57 PM

I would agree with RadioImp, but seen as in order to travel in time to give it to yourself, so you don't have to build it, you still need to build one. Hence my answer is one!

Oliver_Drew

# @ Saturday, November 27, 2004 8:46 AM

I'd be inclined to go along with a mixture of RadioImp and Oliver_Drew. Makes certain sense that you'd have to build one in order to go back to before you built it - BUT if you went to a time before you'd built it, yesterday say, would you actually have built it, as you hadn't built it yet, but had travelled in it....?! I'll stop now - confusing myself!

Bobster

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