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The ocean was less violent Friday but the National Weather Service warned that another round of extremely dangerous surf conditions would return Saturday.

Ready, get set, go! Let's compare a sperm whale plowing through the ocean to a human sperm plowing through a glass of water: The whale barely notices the water it's in; the sperm — oh, gee — it's got a problem. How it solves that problem — being much closer to the size of the water molecules around it — is ... well, masterful.

The lack of hard currency is a severe problem for the southern African nation.

It is estimated that two million children under the age of 15 live with HIV and most of them are in Sub-Saharan Africa. On World AIDS Day, Pamela Barnes, President and CEO of the Elizabeth Glaser Pediatric AIDS Foundation, talks about the challenges facing children and parents with HIV.

The grass pea is one: a hardy crop that can thrive in a drought. An agriculturist is spearheading an effort to diversify what farmers grow as climate change threatens staples like corn and wheat.

Rheumatic heart disease, the No. 1 killer of American children a hundred years ago, is largely gone in this country now. But it's still wreaking havoc in Africa despite the fact it's preventable with antibiotics. Filmmaker Kief Davidson, in his film Open Heart, tells the story of eight Rwandan children who need life-saving cardiac surgery, and the one hospital that can help them. Audie Cornish speaks with Davidson about his Oscar-nominated short documentary.

A tropical wave that has moved off the coast of Africa since Thursday has a very good chance of strengthening through next week.

South Africa's Soweto Gospel Choir combines traditional African gospel and Western Christian music to form a rich sound. In a visit to NPR, the group performs songs from a new CD, Voices from Heaven.

Acclaimed Ugandan-born singer and instrumentalist Samite talks about how Africa's child soldiers inspired much of his latest CD, Embalasasa, and about his broader mission to help young African victims of war and those infected with HIV, the virus that causes AIDS.

Pieter-Dirk Uys (pronounced "Peter Dirk Ace") is known for politically charged performances, touching on AIDS and apartheid. He's described himself as a "middle-aged, fat, bald Afrikaner Jewish drag queen from Cape Town." Writing in The New Yorker, Calvin Trillin called Uys South Africa's leading satirist. He's just won an Obie Award for his one-man show Foreign AIDS, performed at the La MaMa Theater in Manhattan last year. Uys' present show is Elections and Erections, now in London at the Soho Theater.