[RoughDobermann]

Yep, I agree. After all, "everything that could ever be invented has already been invented..."

[gomaaa]

Out of curiousity, who said that?

[Hodar]

Of course, they are only warning signs -- even a claim with several of the signs could be legitimate.

As rules of thumb, I think the author has a good point. However, just because someone thinks something is impossible, doesn't necessarily make it so.

[Lonesome in Massachussets]

That isn't what he said.