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In 1202 Leonardo da Pisa (aka Fibonacci) taught Western Europe how to do arithmetic with Arabic numerals. In Man of Numbers: Fibonacci's Arithmetic Revolution, Keith Devlin describes how basic arithmetic changed commerce, banking, science and technology.

House Democrats have thwarted a GOP attempt to remove New York Rep. Charles Rangel as head of the powerful Ways and Means Committee. Rangel is under a House inquiry for not disclosing all of his personal assets and income. The question is how Rangel's ethics woes shake out politically.

Human Rights Watch is calling for the International Criminal Court to investigate attacks the rights group says amount to war crimes in West Darfur.

The loan forgiveness comes after past mishandling of income-driven repayment plans, which were designed for low-income borrowers. The move will erase $39 billion in federal student loan debt.

When Columbus crossed the Atlantic in 1492, his journey prompted the exchange of not only information but also food, animals, insects, plants and disease between the continents. In a new book, Charles C. Mann describes the aftermath of Columbus' arrival in the Americas.

Some big companies have been trying to water down federal rules that would force them to disclose their greenhouse gas emissions. A new California law may push them into transparency.

When Columbus crossed the Atlantic in 1492, his journey prompted the exchange of not only information but also food, animals, insects, plants and disease between the continents. In a new book, Charles C. Mann describes the aftermath of Columbus' arrival in the Americas.

The author spent more than five years writing and researching her book, Inside Scientology: The Story of America's Most Secretive Religion. It gives a detailed account of the lives of founder L. Ron Hubbard and the man who succeeded him, David Miscavige.

Across the country, new gas pipelines have met political opposition, protests and lawsuits. In Pennsylvania, one major project has also sparked criminal investigations.

The Taliban of today has a sophisticated social media presence. It has harnessed online platforms as a tool of propaganda and is now using it as a way to govern.