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Exiled former Pakistani Prime Minister Nawaz Sharif says he will challenge President Gen. Pervez Musharraf in elections this fall, even as Musharraf considers a power-sharing agreement with another rival that would have him stepping down as head of the army.

Inventables is a company that scouts trade shows, combs the Internet and studies specialty publications to find cool new ways to improve already existing products. Companies pay up to $250,000 a year to subscribe to a directory of Inventables' ideas.

In the face of rising homicide rates, Philadelphia's police chief has plans to recruit 10,000 volunteers to patrol city streets and be on the lookout for criminal activity. They would be unpaid and unarmed.

Football coaches are reminding players about good tackling techniques ever since the cervical spine injury of Kevin Everett, tight end for the NFL's Buffalo Bills. But one coach, who also runs a spine care clinic in in Portland, Ore., says neck strengthening at younger ages can also help.

China's envoy on Darfur is in Washington, responding to critics who accuse the fast-rising Asian power of turning a blind eye to bloodshed in the Sudanese region out of economic self-interest. In particular, China has been bloodied by a Hollywood campaign to re-label the 2008 Olympics as the "Genocide Games." China says the Western critics are hypocrites who have exploited oil resources globally but now condemn Beijing for its oil exploration.

Gen. David Petraeus said some 30,000 troops may be able to go home by next summer, leaving 130,000 in Iraq.

A group of elder statesmen, including Archbishop Desmond Tutu and former President Jimmy Carter, visit Sudan's troubled Darfur region. But they run into problems with Sudanese security forces.

An Italian engineer believes a mural by Leonardo da Vinci that hasn't been seen for 500 years is hidden behind another wall painting, and he says he can prove it. Maurizio Seracini plans to use an energy beam that can read pigments through walls.

Oprah Winfrey has endorsed Sen. Barrack Obama (D-IL) for president and has been campaigning with him. Her participation in the campaign is making news because of her cultural reach and influence.

Captains are leaving the Army in large numbers, especially West Point graduates. But the Army is having some success with large bonuses to persuade them to stay. It's also increasing its take of officers from Officer Candidate School, which takes four months compared with West Point's four years. But that practice is raising quality concerns.