So, I started applying this relationship theory to Facebook Graph searches.

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We can only speculate on the nature of their relationship, but the most obvious theory is that Ferguson sees so much of himself in the fiercely driven firebrand, that he now shares an automatic empathy with Keane.

BBC: Keane's hell freezes over

This could, in theory, improve America's relationship with both the Arab states and Europe.

ECONOMIST: American diplomacy

In theory, inequality has an ambiguous relationship with prosperity.

ECONOMIST: For richer, for poorer

And although that may seem blindingly obvious to you now that you just read it, the entire edifice of Modern Portfolio Theory is based on ignoring the relationship between economics and finance.

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The theory goes that bonds and equities work in an inverse relationship with investors fleeing one when the other is en vogue.

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Regardless of whether you buy McKenna's theory, he does provide a compelling case for the relationship between "cosmic, out-of-body euphoria" and the cognitive leaps to which it can give rise.

CNN: Can ideas get you high?

Recently, Salon.com interviewed researcher Mark Regnerus of the University of Texas at Austin about his theory (basically) that women should withhold sex until later in the relationship in order to get a commitment.

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