Yah. Good point. But if I remember correctly, Bill Bryson's argument was that it TOOK 7 extinction periods for life to evolve to what it is today. So if we're

Yah. Good point. But if I remember correctly, Bill Bryson's argument was that it TOOK 7 extinction periods for life to evolve to what it is today. So if we're talking about more intelligent life forms than our own, then perhaps that probability is still small. Who knows though.