In other words, one of the reasons we cooperate with others is to avoid feeling guilty.

FORBES: The Neuroscience of Guilt Uncovers the Origin of Cooperation

In the more than 36 years I have practiced criminal defense law, I have had many occasions to represent people who, out of self-interest, chose to cooperate with law enforcement against others in order to avoid criminal prosecution or obtain leniency.

FORBES: Why do people have a negative view of cooperators?

Like King Hussein, Abdullah is evidently going to considerable lengths to cooperate with our government, the Israelis and others fighting terror -- even if his public line is, of necessity, more aloof.

CENTERFORSECURITYPOLICY: Hearing sddresses Saudi, Egyptian unreliability

The team, including Nicola Clayton and Nathan Emery, discovered that the eight pairs were happy to cooperate, with some pairs solving the task straight away, others taking a day or two to work out that team-work was the key to getting their nibbles.

BBC: Rooks team up to solve problems

Mr. Freeh's frustration matches that of others in the FBI with the difficulty of getting the Saudi government to cooperate fully in previous investigations.

CNN: Lowell Bergman: How Saudi Arabia figures into the war on terror