There's a fascinating article on the invention of the wheel, which you can read at http://tech.slashdot.org/story/12/03/04/0412243/why-did-it-take-so-long-to-invent-the-wheel?
The section that caught my eye is this: that the invention of the wheel-and-axle was "a task so challenging archaeologists say it probably happened only once, in one place".
Hmmm - it seems to me that the complexity of life itself, leave alone that of our human bodies and minds, exceeds the wheel-and-axle by a fair bit. What are the odds, then, of multiple "lower beings" evolving into "higher beings" in close enough physical proximity that they could procreate and reproduce? It's not enough just to have a single lower being evolve: you need to have a Mr and Mrs evolving-lower-being who can meet up and make new higher-being babies...
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