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Tanzania hopes to jump-start its agricultural production by dramatically increasing the use of irrigation. But existing schemes have had significant, but unintended, consequences: power outages, dried-up rivers, and little, if any, growth in crop yields.

Thousands rallied Sunday on the National Mall in Washington, D.C., to demand international intervention in the Darfur region of Sudan. The deadly conflict there is fueled by religious friction and has created millions of refugees.

Throughout the country, immigrants are being urged to boycott work, school and shopping Monday. The nationwide effort is called "A Day Without Immigrants." It's intended to draw attention to the importance of immigrants in American life. But not all immigrant groups support the action.

Thousands gather Sunday on the National Mall in Washington, D.C., demanding an end to genocide in Sudan's Darfur region. Celebrities, politicians, religious leaders and demonstrators urge President Bush to use his office to strengthen the multinational force protecting Darfur civilians.

A magnitude 8.0 earthquake struck early Thursday near the South Pacific nation of Tonga, prompting tsunami warnings for as far away as Fiji and New Zealand. The warning was lifted after a tsunami of less than 2 feet was recorded.

A rescuer testifying at a public hearing into West Virginia's Sago mine disaster admits to mistakenly saying the trapped miners were alive, when in fact the sole survivor had been located. The rescuer nearly broke down while describing finding the dead miners.

Germany has reversed its decades-long opposition to opening its Holocaust archive. The files contain information on more than 17 million people who were murdered or forced into slave labor by the Nazis.

When the show cast The Doctor as a woman, it avoided exploring her gender. Now that Ncuti Gatwa is The Doctor, critic Eric Deggans writes, Doctor Who shouldn't avoid his Blackness.

The California Air Resources Board announces its plan to reduce air pollution at the state's ports. Nationwide, ports account for a large and growing proportion of a dangerous kind of air pollution: soot from diesel engines. California is leading the way in trying to reduce the problem.

In a long-running government case, a federal judge rules that cigarette makers engaged in a 50-year conspiracy to deceive the public about the dangers of smoking. Anti-smoking groups are disappointed that permanent education programs aren't part of the ruling but believe the judge's language creates a strong arsenal for individual smokers to sue for damages for their own smoking-related diseases.