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As North Korean leader Kim Jong Un threatens nuclear strikes on South Korea, Japan and the U.S., there is a new determination across the region to adopt a tougher line. There's talk now in Japan and South Korea that they should have nuclear weapons of their own — a position the U.S. opposes.

North Korea has been a big headache for the United States, with the new leader there saying almost daily that his country is ready to go to war.

North Korea said Tuesday it will restart its long-shuttered plutonium reactor and increase production of nuclear weapons material, in what outsiders see as its latest attempt to extract U.S. concessions by raising fears of war.

Russia is urging the U.S. and North Korea to end an escalating cycle of dangerous provocations after Pyongyang put its missile forces on high alert and American stealth bombers flew practice bomb runs over the Korean Peninsula.

The company has evolved from an Internet directory to a Web portal to a content destination, but its relevance is slipping. Though still profitable, Yahoo fired its CEO this week; whoever takes over needs to be able to navigate the changing Internet landscape, experts say.

Airs Saturday, October 12, 2013 at 4 p.m. on KPBS TV

Microsoft has plenty of reasons to want to acquire online giant Yahoo — 80 billion reasons, in fact. Online ad revenues are expected to double by 2010, reaching $80 billion, and Microsoft is eager to get into the game — if for no other reason than to slow rival Google's historic growth.

Currently 21% of all cell phone users in the U.S. have smart phones which can surf the web and play music, movies and games. We look at the current state of the art, especially I Phone 4 and the Android operating system, the future of Blackberry, and how sales are affecting Qualcomm, which produces smart phone software.

Internet search engine Google is drawing praise from civil libertarians for its refusal to hand over records about the search requests of millions of its users to federal prosecutors. Government lawyers say they need the information to defend a law meant to protect children from online pornography.

The Obama administration will add 14 interceptors to a West Coast-based missile defense system, reflecting concern about North Korea's focus on developing nuclear weapons and its advances in long-range missile technology, officials said Friday.