Scientists at the Roslin Institute, which produced Dolly the cloned sheep, have genetically engineered chickens to produce drugs in their egg whites. Helen Sang, the lead scientist at the Roslin Institute in Midlothian, Scotland, talks about the findings.

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From a deep freeze in California to ice storms and frigid temperatures across much of the United States, winter is finally here. Kevin Trenberth, senior scientist at the National Center for Atmospheric Research, talks about extremes in recent weather.

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Still searching for that unifying theory of physics, scientists gather in Tucson, Ariz., to talk about gravity. Dimitrios Psaltis, assistant professor of physics and astronomy at the University of Arizona, talks about what researchers hope to learn.

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A new off-Broadway play opens, and it celebrates, of all things, a high school math whiz. Playwright Kathryn Walat talks about the production, Victoria Martin: Math Team Queen, which asks the question: Can a girl know Pi to 53 decimal places and still be popular?

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Scientists report they've found as many as nine mercury hot spots in the Northeastern United States, places where mercury levels are far above what's considered safe. Where does the mercury come from, and what should be done to regulate it?

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