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The Interoceanic Highway will stretch from Brazil's Atlantic coast to Peru's Pacific ports, creating economic opportunities for locals. But conservationists worry about risks to the Amazon rainforest.

The Obama administration is advocating the development of a nationwide system of high-speed rail lines to ease traffic, help the environment and boost the economy. See an interactive map with details of the proposed projects.

A year ago, a meltdown in the U.S. mortgage market sparked a worldwide crisis that led to rapid, sweeping changes in the financial system. As Wall Street giants teetered, governments stepped in with trillions of dollars in bailouts to prevent a complete collapse. A timeline offers highlights of the past year.

Washington Post reporter Todd Frankel explains how the AR-15 was adapted from the M16 military combat automatic rifle, and how it became an icon of gun culture and a favored weapon for mass shooters.

Edward M. "Ted" Kennedy, well known as part of his family's political dynasty, spent more than four decades in the Senate, where he championed health care, education and labor. Here, a look back at his life.

Photographs show the results of the 2010 midterm elections.

Twelve Muslim women discuss what it means to wear the headscarf — and why they decided to take it off.

Photos from inauguration celebrations across the U.S. and around the world.

As the digital age pushes our correspondence with each other online, we see fewer invitations, cards and handwritten letters arrive in our mailboxes. But we no doubt all have special mail -- a faded postcard, a well-worn greeting card, an old love letter -- that we keep tucked away.

The legendary composer and singer showed up at NPR's Culver City studios just before the dead of night to talk about her "helium voice," overcoming polio and painting songs with Bob Dylan.