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Steve Moore, a former federal investigator, says that the knife Italian prosecutors claim is the murder weapon couldn't have made the wounds on Meredith Kercher's body. (Today Show)

After a payback pitch narrowly missed Washington's Nyjer Morgan, he stormed the mound to confront Florida pitcher Chris Volstad. TODAY's Natalie Morales has more details. (Today Show)

In preparation for Hurricane Earl's swipe at the East Coast, mandatory evacuations are issued for coastal areas of North Carolina. TODAY's Al Roker reports from Kill Devil Hills. (Today Show)

A high-tech surveillance weapon used to hunt terrorists is now helping scientists study and predict hurricanes. NBC News speaks with NASA officials at Edwards Air Force Base in California about Global Hawk's new mission. (Nightly News)

Police say James Lee had a history of protesting in front of the Discovery Channel building in Silver Spring, Md., handing out rambling leaflets calling for more programming about global warming and animal extinction. NBC's Tom Costello reports. (Today Show)

Rob Rivas, the NBC News staffer who spoke to Discovery Channel gunman James Lee during the hostage crisis, tells TODAY's Matt Lauer that an 'anxious' James Lee 'wanted to have his story told.' (Today Show)

Political pundits are keeping their eye on the Iowa Republican Party's Reagan Dinner at which Sarah Palin is planning to headline. Could this be the venue where she announces her presidential campaign' NBC's Kelly O'Donnell reports. (Today Show)

Actor Michael Douglas, who has begun chemotherapy and radiation treatments for aggressive stage 4 cancer, faces hair loss, changes to his voice and severe fatigue. NBC's Miguel Almaguer reports. (Today Show)

As TODAY's Natalie Morales reports, '90210' fans are celebrating today's date, which mimics the iconic Beverly Hills ZIP code that was made famous by Aaron Spelling's hit TV show. (Today Show)

A controversial bill that would have banned plastic bags in California was defeated in the state's Legislature. NBC's Brian Williams reports (Nightly News)

The potential strike zone for the Category 4 storm stretches from North Carolina to New England. NBC's Al Roker reports. (Nightly News)

As millions of Americans prepare for the long Labor Day Weekend, many along the East Coast are battening down the hatches as Hurricane Earl approaches. NBC's Ron Mott reports. (Nightly News)

The Weather Channel's Bryan Norcross reports. (Nightly News)

A tense standoff between a hostage-taker and police at the headquarters of the Discovery Channel lasted about four hours Wednesday before Maryland police shot the gunman and rescued the small number of hostages he was holding. NBC's Tom Costello reports. (Nightly News)

Good news on the economic front sent stocks up nearly 250 points Wednesday despite the plunge in auto sales. NBC's Brian Williams reports. (Nightly News)

U.S. forces officially stepped back into a supporting role and let Iraqis take the lead in their own security. NBC's Brian Williams reports. (Nightly News)

President Barack Obama launched a new round of Mideast peace talks Wednesday. NBC's Andrea Mitchell reports. (Nightly News)

Alaska Sen. Lisa Murkowski conceded the Republican primary race late Tuesday, officially handing the nomination to her opponent Joe Miller, a political unknown who ran with the backing of the Tea Party. NBC's Brian Williams reports. (Nightly News)

Sept. 1: People Magazine reports that actor Michael Douglas suffered from a sore throat and other symptoms for months before doctors discovered a throat tumor three weeks ago, but now he's in treatment and hopeful for a recovery. NBC's Robert Bazell reports. (Nightly News)

A new study in the Harvard Business Review reveals that office gossip can actually have positive effects, including helping to relieve employee anxiety and bring problems to managers' attention. NBC's Brian Williams reports. (Nightly News)

In a report to a Congressional committee, BP revealed that the company has spent more than $93 million on advertising in the last three months. The report also pointed out the company has given nearly as much money to badly affected states in order to promote tourism. NBC's Brian Williams reports. (Nightly News)

During a speech in San Francisco, Apple CEO Steve Jobs said that the company has sold a whopping 275 million iPods. He also said that with lots of new features included in the new, upcoming iPods, the company hopes to sell millions more. NBC's Brian Williams reports. (Nightly News)