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Envelopes sent to a senator and President Obama contained a substance that initially tested positive for ricin.

Marathoner and Runner's World contributor Amby Burfoot talks about the vulnerability of running 26.2 miles of public space, the Boston Marathon as a holy grail and the importance of being cheered on. Burfoot won the Boston Marathon in 1968 and has run every five years since. He was there Monday.

Also: Tensions remain high on the Korean Peninsula; President Obama reportedly plans to propose some cuts in projected spending on social programs; building collapse in India kills and injures dozens of people.

The number of kids with dangerous levels of lead in their blood hasn't declined much in the past decade, as the government has remained focused on managing lead-based paint. Now researchers argue that more attention to contaminated soil is needed to prevent lead poisoning.

Some advocates argue that primary care doctors, surgeons and other specialists could add palliative medicine to their usual care. Removing bottlenecks for certification of palliative care specialists could also help.

The remark — which Obama made during a fundraiser — was called sexist by some. Obama said he regretted the "distraction it caused."

Saccharomyces cerevisiae is poised to become the nation's first official state microbe. Oregon is grateful, very grateful, for all the yeast has done for the state's booming craft beer industry.

A majority in the U.S. Senate now supports gay marriage, but a handful of prominent Democrats still haven't joined their party on the issue.

With D.C. real estate booming, it's no surprise that the government is thinking about unloading a building seen by many as an eyesore. The J. Edgar Hoover Building, headquarters of the FBI, sits on a valuable spot along Pennsylvania Avenue, not far from the Capitol and the White House.

Nearly two week after rebels seized control of the Central African Republic and ousted its president, the country is a shambles after widespread looting. Conflict-weary citizens want peace and to choose a new government, but it's far from certain that the future will more stable than the past.