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In Beijing, Assistant U.S. Secretary of State James Kelly continues efforts to end the impasse over North Korea's nuclear program. The United States wants China, North Korea's closest ally, to pressure Pyongyang to give up its nuclear ambitions. Anthony Kuhn reports.

It turns out many office thermostats are just for show, but the placebo effect seems to work on fussy cubicle-dwellers.

Government lawyers on the Enron Task Force are stepping up prosecution following the holidays. The so-called "superseding indictment" could bring additional charges against Enron's Chief Financial Officer Andrew Fastow. It could also name new defendants. NPR's Wade Goodwyn reports.

Over the past decade the states have added safeguarding the environment to their to-do lists. Now, states struggle with the worst fiscal crisis in 50 years, and they're being forced to make tough choices and review priorities. Environmental protection moves pretty far down the list. NPR's Greg Allen reports.

NPR's Robert Siegel and NPR's Michele Norris read from some of this week's listener letters.

Everyone who has ever pondered whether chicken wings serve a purpose beyond deep fat fryers and bleu cheese sauce will be bowled over by the apparent benefits of wing flapping in flightless birds. NPR's John Nielsen reports on a study in this week's Science magazine showing how true flight may have evolved from these beginnings.

Insects known as "walking sticks" have gained and lost wings several times over the last 10 million years. At least that's what a study in this week's issue of Nature magazine contends. NPR's Michele Norris talks with Michael F. Whiting, professor of evolutionary biology at Brigham Young University and lead author of Loss and Recovery of Wings in Stick Insects.

Enormous deficits loom over the federal budget this year and next. The White House is pressing Senate Republicans to trim nearly $10 billion from spending bills approved last year when Democrats ran the Senate. Democrats respond that the president's proposed tax cuts need trimming -- not federal spending. NPR's David Welna reports.

A chain of Hong Kong health clubs emphasizes modesty -- or perhaps vanity -- in an age of instant information. Also, they name hurricanes, don't they? Well, Nebraska Sen. Ben Nelson has a plan to personalize a much different -- and more local -- form of natural disaster.

NPR's Michele Kelemen reports the White House plans to push harder to bridge the gap between Venezuela's president and opposition forces that want him out, and end the opposition strike that's paralyzed Venezuela's oil industry. The Bush administration wants Latin American leaders to join the effort. Opposition forces have been striking for more than six weeks against President Hugo Chavez.