So instead of 'knowing' where to go, it is also possible that the slime-mold 'smells'
where he has to go to.

After reading Alex' reaction I looked for the article he referred to and found the following site:http://www.abc.net.au/science/news/stories/s189608.htm.

Here you can see the maze and the 'slime-mold' following the shortest route.
But this doesn't convince me completely that the slime-mold is intelligent. As stated in on this site, the slime-mold first grew out to cover the whole maze. The maze had four routes through, to get from one exit to the other. Food was placed at both exits, and after eight hours, the slime mould had shrunk back so that its 'body' filled only the parts of the maze that were the shortest route from one piece of food to the other.

To me this points more into the direction of cell-to-cell signalling by means of chemicals. You can see this as a form of intelligence (in fact, our brains function exactly like that), but if you look at it like that, then the cells in my fingers with which I am writing this mail can also be seen as intelligent, since the cells of my fingers also have cell-to-cell signalling :)

Martijn