the witchdoctor lifted up a finger, looked across at the goblin and continued by saying "...look, just remember, "it's "divide either of those into the number seventy" goblin...", as if it meant something important, or was supposed to mean something important while watching the goblin's face until a slight expression of disappointment replaced the more familiar smile for a moment as the goblin's expression just remained a solid blanc, listening that is but blanc as ever, so the witchdoctor turned his head slightly to the side still looking, regained his smile, and continued, "...knowledge goblin, is not "what you know" but discerning from "what you know" both "what it actually means" and "how it has been presented to you", for example "10% steady growth per year" is an unobtrusive way saying "doubles in seven years" which sounds more shocking doesn't it, but depending on which one you hear of course, you'll register it differently won't you, and that's been their trick all along, and yet once you know it as their trick, simply the spin they give towards something betrays their stance to it and you...", “...yes but what about that seventy bit, what's that all about...”, “...well now, “divide into seventy” is like a currency conversion rate you see in the bank only that this time it's for "the annual growth rate of something to the point where and where it doubles", that's all, for example take that “10% annual growth rate”again, divide 10 into seventy, and you get seven, that is seven years until it will double, or take “doubles in seven years”, divide 7 into seventy and you get 10, a 10 percent growth rate then, all rather simply don't you think, even if the economists call it "the rule of 70" and the conversion rate as a "logarithm" here, but that been their way of hiding their tricks again till now, well let's just think that we're borrowing their secret from them..."