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The bridge collapse on Interstate 5 that sent two cars into the Skagit River resulted from a semi-tractor trailer tearing into an overhead girder rather than problems with the roadbed itself, officials said.

The change in policy has important implications for the drone program in Pakistan, where future negotiations could center on whether Pakistan tries to gain joint control of the program or seeks to end it outright.

Here's the beef: Enjoy the Memorial Day grilling, because retail beef prices are widely expected to set new records in coming weeks.

Detroit museum officials said they strongly opposed any forced art sales, after the powerful emergency manager of the city indicated that its crown jewels could be sold to pay off creditors in the event of a bankruptcy filing.

The IRS unit under fire for its reviews of conservative organizations has a long history of targeting particular groups for extra scrutiny, including foreclosure-assistance charities and credit-counseling services.

A group of 42 people over the age of 80 have been identified by Northwestern University researchers as having excellent cognitive function and memory capability typical of those decades younger.

To report on food sourcing and access in the United States, author Tracie McMillan went undercover, picking garlic in the fields in California and working at a Walmart in Michigan and an Applebee's in New York. She published a book about what she learned from these experiences called The American Way of Eating. Knowledge@Wharton recently spoke with McMillan about how income level affects food consumption, who controls the food we eat and why the food system might be transformed if people threw away less food. (Podcast with transcript)

Named one of The Wall Street Journal's top 10 nonfiction books of 2012, Steven Ujifusa's A Man and His Ship: America's Greatest Naval Architect and His Quest to Build the SS United States brings William Francis Gibbs' story to life. Wharton legal studies and business ethics professor G. Richard Shell recently sat down with Ujifusa to learn more about what inspired the author to tell Gibbs' story, what led Gibbs to build ships and how the builder's firm became responsible for 70% of all ships built during World War II. (Video with transcript)

How do we know which of our successes and failures can be attributed to either skill or luck? That is the question that investment strategist Michael J. Mauboussin explores in his book The Success Equation: Untangling Skill and Luck in Business, Sports, and Investing. Wharton management professor Adam M. Grant recently sat down with Mauboussin to talk about the paradox of skill, the conditions for luck and how to avoid overconfidence. (Video with transcript)

Whether you are an educator, an art director or a project manager, you are in sales. So argues bestselling author Daniel Pink in his new book, To Sell Is Human: The Surprising Truth about Moving Others. Pink recently visited the University of Pennsylvania as a guest lecturer in the Authors@Wharton series. Wharton management professor Adam M. Grant interviewed Pink while he was there to learn more about the ideas in his book, including why consumers mistrust salespeople, what the new ABCs of selling are and why questions may be the greatest selling tool. (Video with transcript)

Though stock market volatility continues to rattle investors' nerves, the future looks bright for equities in the U.S. and many emerging markets, according to Wharton finance professor Jeremy Siegel. In an interview with Knowledge@Wharton, Siegel says that investors should think about reducing their bond holdings, buying more stocks and keeping just enough cash for a rainy day and other liquidity needs. He also discusses the housing market and offers his take on where the stock market is headed for the rest of 2013. (Video with transcript)

With the spotlight on U.S. budget cuts, a timely book looks at the unique nature of the country's debt and the options available to avoid hitting the debt ceiling. Is U.S. Government Debt Different? -- a collection of 15 articles published by the Wharton Financial Institutions Center -- is co-edited by Wharton finance professor Franklin Allen, who shares insights from the book with Knowledge@Wharton. (Video with transcript)