Considering the dual nature of this vehicle, 23 miles per gallon is impressive.

FORBES: The Flying Car Has Arrived (Seriously)

Part of the problem was the dual nature of his operation.

NPR: Madoff Was Magnet For Some, Not All, Investors

Part of the reason, their study concludes, is the dual nature of the economy: Many of the fastest-growing companies are outside the public markets and therefore not available to stock investors.

FORBES: The great stock illusion

It underscored the unusual dual nature of Google, and perhaps a future challenge for Page.

FORBES: Can Google's Page Mean Business?

Complicating the issue is the largely dual-use nature of space technology, which can be used for both civilian and military purposes.

CNN: Will China overtake America in space?

Possibly he was referring to the old paradox of our dual nature as human animals: part logical, part intuitive.

FORBES: Silicon Valley's Future

The curriculum is designed to be of dual nature, containing both socio-educational aspects as well as literacy work which work together to expand the cultural horizon of the participants and raise their self-esteem.

UNESCO: Country Profile: Uruguay

Rieder says King's dual nature -- the "crossover King" with the refined, professorial manner, and the private, even sarcastic King -- take turns on center stage in the letter.

CNN: How MLK became an angry black man