That is not bad for a risk-free asset with a maturity of one to six years in theory, and often only a few months in practice.

ECONOMIST: India's finances

The company says it uses modern portfolio theory to build an optimized allocation across six asset classes.

WSJ: The New Money Apps

"He is a better candidate now than when he was, in theory, the big front-runner six months ago, " Murphy says.

NPR: For McCain, Once and Again the Underdog

"The fact that retail is out of favor is a theory that has been trumpeted across the Street for the last six months, and therefore has already been worked into the stock price, " says Bob Napoli, brokerage analyst at ABN Amro, pointing out that Merrill's shares are the most attractive relative to its historical trading range.

FORBES: Magazine Article

Extra dimensions are of interest because string theory, a class of mathematical models based on quantum theory that seeks to describe reality in the most fundamental way, requires that there be at least six of them, maybe more.

ECONOMIST: Cosmology