 Oh, it's someplace between 10,000 and 10 million. That's not an equation. That's dartboard physics. That's the first thing. Secondly, it is presumed that there are aliens out there, and I don't disagree with that. I've got evidence. They're coming here, and they leave physical traces, and they're seen and monitored on radar and by pilots, etc., etc. The SETI people don't provide any evidence that there's anybody out there.