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The administration is pledging $100 million toward a project to stop HIV infections once and for all. There's growing optimism among scientists that it may be possible to get patients' immune systems to control HIV without drugs, or even to eliminate the virus from the cells of infected people someday.

Transportation officials are investigating what caused a Metro-North Railroad passenger train to derail along the Hudson River in New York on Sunday morning. The crash left four dead and injured dozens more.

The U.S. aims to reduce carbon dioxide emissions by 80 percent by 2050. Wind and solar power can help. But folks doing the math say other pricey, controversial technologies — such as burying carbon gas underground, and expanding nuclear power — are also likely to be part of a low-carbon future.

The polio outbreak in Syria has spread to four cities, and new cases are suspected each day. But U.N. agencies responsible for combating the outbreak can work only with the Syrian government. This limitation has hobbled vaccination efforts in rebel-held regions, where the virus was first detected.

Vice President Joe Biden's trip to Asia was supposed to be about trade. Biden's first stop is in Japan, which is anxious for support from its U.S. ally in its confrontation with China over the sovereignty of disputed islands in the East China Sea. Biden will then visit Beijing, which wants the U.S. to reign in what it sees as Japanese nationalist aggression. The trip ends in South Korea, which has its own issues with Japan and China.

The economy adds a decent number of jobs every month but there are big questions about the quality of some of those jobs. Many people getting hired these days do not have anything resembling a regular schedule and work fragmented and unpredictable hours.

Millions of consumers went online to get a crack at shopping deals for Cyber Monday. Online sales were $2 billion for the one day — up nearly 20 percent over the same time last year.

Renee Montagne talks to Michelle Singletary, financial columnist for The Washington Post, about what consumers need to understand about putting income aside for retirement. Investment company Charles Schwab recently did a survey that showed most people feel like they don't know what they are doing with their retirement funds.

Collective Cadenza, or CDZA for short, is a loose-knit group of musicians — many of them graduates of Juilliard. They've made a name for themselves with funny YouTube videos that have received millions of views. As a result, the group was invited to perform live at the inaugural YouTube Music Awards alongside Eminem, Lady Gaga and Arcade Fire.

From the White House and the Supreme Court on down, gay rights advocates have won a string of victories this year. Many Americans remain opposed to same-sex marriage, but support for gays and gay marriage has been rising — particularly among young people.