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Artificial discs have long been used in Europe but remain experimental in this country. Two major studies nearing completion could change that: For the first time, scientists will know just how such implants compare to the only other alternative - major surgery to fuse together two vertebrae in the lower back. (AP Graphic)
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Palestinian militants patrol the streets of Beit Hanoun in Northern Gaza, May 20, 2003. Despite a wave of Palestinian suicide bombings, Israel relaxed its military grip on Tuesday on Beit Hanoun, an area of where the first steps could be taken in a U.S.-backed peace plan. (Jean-Paul Pelissier/Reuters)
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Middlebury College students with Project Bio Bus stand on the old school bus modified to run on used vegetable oil in Middlebury, VT, Monday, May 19, 2003. The group is touring rock climbing destinations and dropping off college friends along the way while driving across the country this summer. (AP Photo/Alden Pellett)
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Avtar Singh, front, addresses the media with his son Hardeep Singh, Tuesday, May 20, 2003, at a hospital in Phoenix. Avtar Singh, seriously wounded in a shooting Monday, was apparently targeted because of his religious faith, police said Tuesday. Singh is a permanent resident who has lived in the U.S. for 18 years. (AP Photo/Matt York)
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Libyan leader Moammar Gadhafi, right, and Tunisian President Zine el Abidine Ben Ali, left, gesture towards residents as they walk through downtown Tunis, Tuesday, May 20, 2003. Ghadafi began his five-day visit to Tunisia on Monday. (AP Photo/Hassene Dridi)
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A sculpture called Blockhead, by U.S. artist Paul McCarthy, sits on display outside the Tate Modern art gallery in London. The first major installation to be seen on Tate's North Landscape features two sculptures believed to be among the largest inflatable structures ever. Blockhead measures in at over 35 meters high, and Daddies Bighead is 16 meters high. REUTERS/Matt Dunham
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National Guard Spc James Beggs, left, and NYPD Officer Joshua Cureton, keep watch at New York's Grand Central Terminal Tuesday, May 20, 2003. New York City has been at a level orange terror alert since March 2002. The Bush administration raised the rest of the country to orange as well, amid fears that a wave of attacks overseas would spread to the United States. (AP Photo/Frank Franklin)
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Londoner Marcus Fitzgerald gets to grips with the latest attraction at Madame Tussauds in London, the American film actress and singer Jeniffer Lopez, on Wednesday May 21 2003. She forms part of a new exhibition that has its focus on the modern day A-list celebrity.(AP Photo/Dave Caulkin)