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NodeXL is a template for Excel 2007 that lets you enter a network edge list, click a button, and see the network graph, all in the Excel window. You can easily customize the graph’s appearance; zoom, scale and pan the graph; dynamically filter vertices and edges; alter the graph’s layout; find clusters of related vertices; and calculate a set of graph metrics. Networks can be imported from and exported to a variety of data formats, and built-in connections for getting networks from Twitter, Flickr, YouTube, and your local email are provided.

Arthur E. Levine, a former president of Teachers College, where Dr. Ravitch got her doctorate and began her teaching career in the 1970s. “Now for her to suddenly conclude that she’s been all wrong is extraordinary — and not very helpful.”

In 2005, she said, a study she undertook of Pakistan’s weak and inequitable education system, dominated by private and religious institutions, convinced her that protecting the United States’ public schools was important to democracy.

She remembers another date, Nov. 30, 2006, when at a Washington conference she heard a dozen experts conclude that the No Child law was not raising student achievement.

en up working on a math problem because you couldn’t figure out the next step? Wolfram|Alpha can guide you step by step through the process of solving many mathematical problems, from solving a simple quadratic equation to taking the integral of a complex function.