Two-Way

Denmark, together with Greenland, today will claim around 350,000 square miles of the continental shelf in the Arctic Ocean, in an area around the North Pole that is slightly larger than the size of Texas and Oklahoma combined.

Armchair socialists aren't sitting in their armchairs anymore — and neither are their right-wing counterparts, according to a study published in BMJ, the former British Medical Journal, as part of its annual tongue-in-cheek Christmas edition.

The daily lowdown on books, publishing, and the occasional author behaving badly.

Apple is sliding back under the judicial microscope Monday in a legal challenge that could bear big implications for the e-book market. The 2nd U.S. Circuit Court of Appeals is slated to hear the company's appeal of a verdict that found it guilty of violating antitrust law.

Uber's troubles are mounting. The ride-sharing service was criticized in Australia after its "surge pricing" kicked in, quadrupling fares for some customers trying to flee the area in Sydney where a gunman took hostages in a cafe.

Here's a screenshot that one customer sent to Mashable with details of the increased fare:

Family members of some of the victims of the 2012 mass shooting at Sandy Hook Elementary School in Newtown, Conn., have filed a lawsuit against the manufacturer, distributor and seller of the rifle used by the gunman to kill 26 people.

One of six northern white rhinos left in the world died at the San Diego Zoo on Sunday.

Angalifu was thought to be 44 years old. He came to the park from Sudan in 1990 and had been treated for a range of age-related ailments.

U-T San Diego reports:

A gunman was holding an unknown number of hostages at a downtown chocolate cafe in Sydney. Early on Tuesday morning, Australian time, police moved in and said the siege was over.

We're following the news here. Below is a feed of the Australian Broadcasting Corporation's news coverage. ABC is the country's national public broadcaster:

(Last updated at 1:48 p.m. ET.)

Just as the siege entered its second day, police stormed a chocolate shop in downtown Sydney, ending a more than 12-hour hostage standoff that began during morning rush hour.

Invisible Children, the organization that made the viral video Kony 2012, will likely cease to exist at some point in 2015, the nonprofit's leadership says.

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