The risk of an accident grows with each successive night shift, so that a worker is twice as likely to have an accident on the fourth night shift in a row as on the first.

ECONOMIST: No more nine-to-five

Messaging accounted for approximately 31% of total data revenues in the fourth quarter of 2011, a decrease compared to 32% in the third quarter of 2011 and 36% in the fourth quarter of 2010 related to a shift in the data revenue mix towards mobile broadband data plans.

ENGADGET: T-Mobile lost more customers in Q4, will launch LTE in 2013 with AWS spectrum from AT&T

But they may have to shift into fifth or at least fourth gear instead of the usual second gear of the Chinese government.

FORBES: China Official Warns Of Tough Months Ahead For Exporters

General Electric booked a stronger-than-expected fourth-quarter profit, propelled by its new shift into oil and gas equipment.

FORBES: GE: New Focus On Oil And Gas Powered Rising Q4 Profit

Fourth, and most dramatically, De Beers intends to shift its focus from controlling supply and fixing prices to driving demand.

ECONOMIST: Diamonds

Last week, the DoJ filed a memorandum in which it conceded that its tracking methods did indeed constitute "a Fourth Amendment search and seizure, " ostensibly marking a 180-degree shift from its previous stance.

ENGADGET: DoJ: Stingray cellphone tracking device falls under Fourth Amendment, but don't ask about it

Martinez's ambitions represent a seismic shift from when he arrived as a player at a club languishing in the fourth-tier of English football 14 years ago.

BBC: Wigan to target Europe - Martinez