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4. e.g. hoop snake.

One reason wheels have not evolved:
There's a great cartoon that shows the Daleks from Dr. Who. They've just rolled to a position at the bottom of a staircase: "This sure buggers our plan to take over the universe."

4. The natural world doesn't have very many paved roads.

#2 Excellent, could reprint it today. i didn't read the Delong link though . . .

@Heller: Um, you're being ironic on Hayek, right?

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