Given both supply-side economic theory and the examples provided by Texas and South Dakota, it is clear that Kansas needs to eliminate both its personal and its corporate income taxes.

FORBES: Kansas Desperately Needs Fundamental Tax Reform

An interest in the academic side of market theory led Neeti Nundy to Wall Street after she graduated from the Massachusetts Institute of Technology in 2002.

FORBES: Life After Wall Street

But there is a flip side to this theory.

FORBES: Biogen IDEC's Twisted Logic

Because it's been - I think that the theory, the corollary theory on the Republican side is that they've been more interested in the Latino vote because that has been perceived as a vote that's more easily contested for.

NPR: Presidential Candidates Target Black Music Festival

His theory was that by letting them see the fun side of the iPad, they would get attached.

FORBES: Is it Time to Occupy CIO?

One theory for the difference between the Moon's far side and near side is an ancient collision with a second natural satellite of Earth.

BBC: Nasa reveals new information about moon probes crash sites

To test his theory, he decided to do something drastic: he shaved off the left side of his mustache.

NEWYORKER: Creative Writing

In theory, the Ceyhan line could also be used for oil from the other side of the Caspian, where Chevron and other oil companies have won huge contracts.

ECONOMIST: Oil out of troubled waters