On ECONOMICS REPORT: Sites that let people give away things they no longer need have grown in popularity. So have barter sites among businesses.

Also on AMERICAN MOSAIC: The New Jersey Hall of Fame names its first members. And hear new music from Nine Inch Nails, the Foxboro Hot Tubs and Elvis Costello.

On THE MAKING OF A NATION: The leaders in Washington did not know it, but the British -- two days earlier -- had ended their orders against neutral American trade.

On EDUCATION REPORT: Teach for America expands its reach with a thirty percent increase in the number of teachers it is providing American schools.

On WORDS AND THEIR STORIES: The word can mean many things, including jealousy.

On EXPLORATIONS: Join us as we learn the basics of scuba diving, talk to an expert, and say hello to a shark.

ON HEALTH REPORT: Women bank their breast milk to help babies in need.

Also on SCIENCE IN THE NEWS: An American study finds more young women are developing the most deadly form of skin cancer.

On AGRICULTURE REPORT: Into the world of cashmere and mohair.

On THIS IS AMERICA: Motorcycle culture in the United States. This week, in South Dakota, is the Sturgis Rally, a major event.

On DEVELOPMENT REPORT: Delegates are expected to call for increases in the treatment and prevention of H.I.V., the virus that causes AIDS.

On PEOPLE IN AMERICA: She created almost 200 dances and made this form of dance popular. Her dance company continues to perform around the world.

On IN THE NEWS: Both candidates have turned to negative advertisements as the election nears. Public opinion studies show Barack Obama and John McCain with almost equal support.

Also on AMERICAN MOSAIC: A question from Ethiopia about how a person becomes a medical doctor in the United States. And the World's Biggest Yardsale.

On ECONOMICS REPORT: One part of the new law could make it easier for some homeowners to refinance to lower-cost loans. Another offers direct government support to the nation's two biggest housing finance companies.

On EDUCATION REPORT: New York University has been in the lead as study abroad programs have grown more popular for American students.

On THE MAKING OF A NATION: President James Madison wanted the warring British and French to honor American neutrality.

On HEALTH REPORT: Some facts about an extraordinary organ, and the threats it faces.

On EXPLORATIONS: A look back at a few of the most important programs that NASA has carried out in half a century of exploration.

Also on SCIENCE IN THE NEWS: A study finds that rising wages, increased democracy help make people happy.