Almost any questions can be answered,cheaply, quickly and finally, by a test campaign. And that's he way to answer them - not by arguments around a table

Scientific advertising has altered many old plans and conceptions. It has proved many long established methods to be folly

Address the people you seek, and them only

Never be led in new paths by the blind

Curiosity is one of the strongest human incentives

Picture what others wish to be, not what they may be now

Human nature is perpetual. In most respects it is the same today as in the time of Caesar. So the principles of psychology are fixed and enduring