No other virtual currency will even come close to that kind of vibrant liquidity and building walls to ring fence a virtual environment will turn out to be a counter-productive strategy.

FORBES: Virtual Currencies and Roach Motels

Things may come to a head in November with a ballot initiative, put forward by the Sierra Club, an environmental group, to ban any new building in a ring around the city.

ECONOMIST: Urban boosterism

Their base is a light industrial building just inside the Moscow ring road, and a passenger lift is only now being installed.

ECONOMIST: Russian computers

Rajaratnam led what has been described as the largest insider trading ring ever, building a network of high-ranking experts in key technology and consulting firms.

FORBES: Rajaratnam's Sentence Brings Closure to the Galleon Scandal

While the city's Labour politicians preside over the building of the huge, shiny new Bull Ring shopping precinct in the city centre, Sparkbrook still has some of the country's most run-down estates, as well as some of its highest rates of unemployment.

ECONOMIST: General election

Rather than using rubber hoses to connect the stationary and moving parts of the building, 3sixty's ingenious plumbing system employs horizontal ring-shaped pipes made of steel.

ECONOMIST: Monitor

All week in Mexico City, a ring of steel had been in place around the building ahead of the ceremony.

BBC: Mexico's Enrique Pena Nieto inaugurated as president

The ring of brick arches was constructed using the same techniques the Romans had perfected in the building of aqueducts, and it was completely clad in marble, now long since stripped away.

BBC: The classic wonders of Rome

His efforts have paid off: a wrestling ring lies next to the soccer field, since officials wouldn't allow it inside the school building.

CNN: Wrestle Mania