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Patients with Alzheimer's disease show clear damage to their brains as they age. But some have wondered whether this damage is a cause of the disease or a result of it. Scientists at the University of Minnesota have found a protein that appears to cause memory loss before brain damage appears.

Iraqi forces loyal to the Shiite-led government were responsible for the recent abduction of about 50 employees from a security company; almost 20 of those abducted have been killed. Sunni political leaders have repeatedly accused the Shiite-led Ministry of the Interior of kidnapping and killing Sunni Arabs.

There will be demonstrations both for and against the war in Iraq this weekend in cities across America, which marks the third anniversary of the invasion. But Washington, D.C., will not be targeted this time. Opponents of the war have a new strategy.

In downtown St. Louis, the opening of the new Busch Stadium is the latest effort to beautify and improve an area that once was called an eyesore and a tragedy. More than 50 businesses have opened in the area, where residential lofts are booming and major projects are building excitement in St. Louis.

Belarus will hold presidential elections Sunday, and the current president, Alexander Lukashenko, is widely expected to win. The European Union and the United States accuse Lukashenko of crushing human rights, and warn of new punitive measures if the election is declared unfair.

For the past two decades, Kurds have traditionally gathered in Halabja, Iraq, in mid-March to mark a grim chapter in their history: the day when Saddam Hussein's government unleashed a poison-gas attack that killed more than 5,000 people. Thursday, that normally peaceful commemoration turned turbulent.

President Bush's choice head the CIA, Air Force Gen. Michael Hayden, begins his confirmation hearings before the Senate Intelligence Committee Thursday. Sen. Pat Roberts (R-KS) and senators from both parties are expected to grill Hayden on issues of privacy and national security, particularly the role of the NSA in collecting the phone records of ordinary Americans.

Steve Inskeep and Renee Montagne read listeners' letters, including praise for stories on China and gardening in London.

If the budget allows, the Census Bureau will be out with GPS devices in 2009 to pinpoint every American dwelling. The collected data is confidential, but some private companies might challenge that law.

The Marine Corps announces a second investigation into the deaths of unarmed civilians in Iraq. The first incident -- which left 24 Iraqis dead in the town of Haditha -- happened in November. The second occurred in April, in a town west of Baghdad. Marine Gen. Michael Hagee flew to Iraq on Thursday.