So, sadly, not a pure and perfect method of identifying real estate bubbles, the heights of the new skyscrapers.

FORBES: Rising Skyscrapers, Not Rising Skirts, Indicate a Recession Coming

I've interpreted Zweig's approach a bit differently than AAII, but at the core of both screens is a method for identifying financially sound growth companies and not overpaying for them.

FORBES: Making Hay With Marty Zweig

"With ETFs the individual investor has tools and techniques that were solely the province of sophisticated investors even a year ago, " says John Bollinger of Bollinger Capital Management, whose Bollinger Bands are a popular method for identifying stocks that have moved outside their normal trading pattern.

FORBES: Surfin' ETFs

The MRI prediction method was 75% accurate at identifying the correct diagnosis.

BBC: Brain scan 'can sort dementia by type'