[david_ar]

> There's also an open question as to whether evolution necessarily leads to intelligent species.

Especially when, in this context, we're talking about a rather peculiar type of intelligence, ie. the propensity to construct spacecraft and broadcast high-powered message-carrying radio signals. It seems very difficult to argue that there's any evolutionary pressure in favour of these behaviours, just given the time-lag from the development of our large brains to this.