They involve helping people talk to each other in a more collaborative and real-time way: How do we recognize people in real-time?

FORBES: Connect

Jews and Muslims may agree that they should be able to butcher animals in the traditional way, but they rarely see eye-to-eye on matters that involve their co-religionists killing each other, like events in the Middle East.

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This is because they involve two leaders, on the Greek and Turkish sides, who have known each other for years (through the trade union movement), and are both publicly committed to compromise and reaching a deal.

ECONOMIST: European politics

An accommodative monetary policy would involve keeping the fed funds rate (the short-term rate at which banks lend to each other) at historic lows so as to encourage consumption and provide cheaper credit to consumers and businesses.

FORBES: Is The Fed In a Crisis of Trust?

This could involve UK Border Agency case workers questioning a couple to see whether they are able to provide accurate personal details about each other and whether they agree on the facts of their relationship, for example how they met.

BBC: Immigrants 'must add to quality of life in Britain'