If you're an entrepreneur or in business yourself, or you're among the highest ranks in the corporate world, no doubt you've had the message drilled in your head: "If you want to be successful, you've got to read 'Think and Grow Rich.'"

And it's true - I know almost all the top guys online and many of the best marketers in the world.

I read the other day about a European company that created a technology for stores for example in a mall to keep teens from hanging out in front of their businesses or loitering.

It's a device that makes a high-pitched frequency that teens can clearly hear yet which most adults can't, because people typically lose the top and low end of the hearing range as they age.