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Over the past decade or so, sigmoidoscopy has been largely abandoned by doctors in the U.S. in favor of colonoscopy to detect and prevent colon cancer. But sigmoidoscopy is easier on patients and is also effective in finding precancerous polyps.

Joe Arpaio sent his deputy on a quest to investigate the citizenship of President Obama. Arpaio had previously said his investigation was funded using donations.

By the early 1900's, the Amoskeag mill was earning its reputation as the textile capital of the world. There may have been other cities that produced more…

The NBA and NHL seasons are coming to a close, but as commentator Frank Deford points out, you couldn't be faulted for overlooking them.

Nearly every sofa and armchair sold in the U.S. is treated with flame-retardant chemicals thanks to an obscure California law. Some experts say the chemicals do little to prevent fires; others worry that they might cause health problems. The industry has opposed attempts to change the law.

Egyptian voters go to the polls over the next two days to vote for president. There are 12 candidates but polls suggest the race is down to four men: two Islamists and two former officials in the regime of ousted President Hosni Mubarak. If no one wins at least 50 percent of the vote in the first round, a runoff will be held next month.

Top stories include the expected testimony of the Secret Service director on the recent scandal involving agents who allegedly hired prostitutes in Colombia; and Egyptians go to the polls today to choose a new president.

The U.S. and other world powers hope to lay out a step by step process that will eventually lead to an end to Iran's nuclear enrichment program. Iran hopes to ease punitive sanctions that are choking its economy.

The pianist's new album features some of the most difficult etudes ever written for solo piano by the Hungarian composer Gyorgy Ligeti. "Ligeti took the piano to places it had never been before," he says, "and makes demands of the pianist and the mind that had never been made before."

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