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Sunday 10pm NOVA - Science/History - GREAT HUMAN ODYSSEY - Discoveries about human origins and how humans have survived climate change and geological...

To learn about the U.S.-Africa Leaders Summit, Melissa Block talks with Deborah Birx, the U.S. Global AIDS coordinator. Birx talks about combating complacency in the fight against the AIDS epidemic.

Linda talks with Scott McGraw, a physical anthropologist, about the extinction of a monkey called Miss Waldron's Red Colobus, whose native habitat is West Africa. The last documented sighting of the red colobus was 20 years ago. McGraw says the monkey was hunted and eaten which is one reason for its decline. Also, there is so little of the West African rain forest left, that there's not enough habitat to support the red colobus. McGraw is an assistant professor of anthropology at Ohio State University. He specializes in West African monkeys.

As the Bush administration presses Iraq to divulge weapons secrets or face attack, Deputy U.S. Defense Secretary Paul Wolfowitz uses a speech in New York to describe what he calls "real disarmament." He cites South Africa, Ukraine and Kazakhstan as good examples of nations that have openly and voluntarily given up nuclear arms. NPR's Vicky O'Hara reports.

In the first of a five-part series on immigration in Western Europe, NPR's Sylvia Poggioli reports that Italy has become a final destination for illegal immigrants from Eastern Europe, Asia, and North Africa, as well as a port of entry. Thousands of illegal immigrants -- many Albanians, Kurds, and North Africans -- are smuggled by sea into Italy each year, trying to make their way to a better life in Europe. In the past, Italy was just a way station on the route to Germany or Switzerland. Now immigrants are staying.

Critics of the fishing industry have long predicted that if over-fishing continues for much longer, "junk species" like jellyfish will start filling up the vacancies. Until recently, there was no evidence that the prediction would come true. But now, scientists report the largest jellyfish invasion ever, off southern Africa.

Archbishop Desmond Tutu, known for work in post-apartheid South Africa, talks with Debbie Elliott about getting people to look at the world in a different way... throwing away old categories and old concepts and starting fresh.

Ameera debuts on Ahlan Simsim — an Arabic-language Sesame Street series for children in the Middle East and North Africa. She's meant to reach kids who are displaced because of conflict.

The great apes of Africa and Asia have long been threatened by hunters, loggers and farmers. But scientists say another threat is rising fast: infectious diseases carried or spread by humans and livestock. NPR's John Nielsen reports.

Secretary of State Colin Powell will visit Africa next week to examine the situation in the Darfur region in Western Sudan, where government-backed militias are accused of carrying out rape, murder and forced evacuations against black farming communities. U.S. officials say they are investigating whether the situation amounts to genocide, but a growing number of lawmakers say the case is already clear. Hear NPR's Michele Kelemen.