Anchor Lisa Mullins speaks with cardiologist Bernard Lown. Dr. Lown won the Nobel Peace Prize in 1985 for his work against nuclear proliferation. He's written a new book -- "Prescription for Survival: A Doctor's Journey to End Nuclear Madness."

Lisa Mullins and Dr. Bernard Lown in The World's studios

Today President Bush called on Zimbabwe's President Robert Mugabe to step down and end his "tyranny." Zimbabwe is now suffering an outbreak of cholera, among the country's many woes. Anchor Lisa Mullins speaks with Zimbabwean journalist Maxwell John about what life is like now in his country.

Zimbabwe at the crossroads

British women of Pakistani descent are sometimes forced or tricked into marrying men back in Pakistan. It's often to help the men secure British visas. But a new law in Britain is giving courts more power to prevent forced marriages. The BBC's Emily Buchanan spends time with some women struggling to get out of forced marriages in Pakistan and some officials trying to help them.

Our daily geography puzzler.

Female voices may convey more than thoughts and emotion; they may also reveal when a woman is ovulating. A recent German study finds that a woman's voice deepens in pitch at the time she's most fertile. Reporter Ari Daniel Shapiro has the story.

The answer to our Geo Quiz today is Kauai, Oahu, Molokai, Lanai, Maui, and the big island of Hawaii. These are Hawaiian Islands where Koa trees grow. Koa wood is used to build some of the world's finest ukuleles. Jake Shimabukoro is a versatile master of the ukulele. He performs on his curly Koa wood ukulele for anchor Lisa Mullins in today's Global Hit.

Today on The World: Economic worries in China as the country's exports falter; Greece struggles to overcome five straight days of rioting; and Ghana makes moves to become the next big call service center.

As China announces a drop in exports, concerns grow over the potential impact on the country's middle class workers. Reporter Jocelyn Ford brings us the story from Beijing.

The Swedish car industry is tied to the American automobile giants, and it's not doing well. Anchor Marco Werman talks to Stefan Lofgre, a business reporter with Sweden's Gothenburg Post newspaper.

Global economic crisis

The World's Laura Lynch takes a look at how the West African country of Ghana is making moves to become the next big call service center.