Today on The World: President-elect Obama announces top members of his national security team; President Bush marks World AIDS Day at the White House; and we follow the journey of US-sponsored AIDS drugs to patients in Africa.

President-elect Obama announced the top members of his national security team today, including Senator Hillary Clinton as his pick for Secretary of State and current Pentagon chief Robert Gates as his Defense Secretary. The World's Katy Clark explains what these choices mean about the role diplomacy will play in the incoming Obama Administration.

Video: Obama nominates Clinton for Secretary of State

Anchor Lisa Mullins speaks with Israeli journalist Yaron Deckel about Israeli reaction to Barack Obama's pick of Hillary Clinton as Secretary of State.

Another key player on the national security team will be the nominee for US ambassador to the United Nations, Susan Rice. Rice is a former Clinton Administration official--she served on the National Security Council and later as assistant secretary of state for Africa. She's an outspoken advocate for humanitarian intervention, known for her intellect and her straight talk. The World's Jeb Sharp has more.

People in Mumbai went back to work today. Anchor Lisa Mullins speaks with reporter Nikhil Dixit about how the city is coping in the aftermath of last week's deadly attacks. Dixit is a crime reporter for the "Daily News and Analysis" newspaper in Mumbai.

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Pakistani President Asif Ali Zardari today called the Mumbai attackers non-state actors and warned against letting their actions lead to greater enmity in the region. But last week's attacks in Mumbai have highlighted the fragile relations between India and Pakistan. The World's Aaron Schachter reports.

Our daily geography puzzler.

The U.S. President's Emergency Plan for AIDS Relief -- or PEPFAR -- has supported life-saving treatment for more than 2.1 million men, women and children living with HIV/AIDS around the world. But despite the success so far, delivering the drugs remains a Herculean task in the developing world. The World's David Baron has the story of what it takes to get AIDS medicine to just one patient in West Africa.

President Bush marked World AIDS Day with a speech at the White House. Mr. Bush gave an update on his administration's anti-AIDS initiative known as PEPFAR. Anchor Lisa Mullins gets an update on PEPFAR from HIV policy expert and epidemiologist Elizabeth Pisani.

Anchor Lisa Mullins speaks to Irish flutist Sir James Galway and Cuban pianist Jorge Martinez. Martinez fronts the band Tiempo Libre. Sir James and Martinez's band have recorded a new album that mixes classical jazz with Latin rhythms.