Behaviours
	...the dots like to be close - but not TOO close... I was working on the problem of comparing the positions of every object to every other object on the screen and setting the speed, direction and distance according to proximity. That's a lot of comparisons and my first few attempts were pretty slow. I think I've improved the coding quite a bit for this one. I've just created a more elaborate version which includes birth, death, food and energy — you can see it here (by the way... this is just about fast enough on my 1Ghz PC - it may be slow on older machines)
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