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Bob Ball is a real estate investor in Portland, Ore., but that's just his day job. For the past 20 years, he has also been a volunteer cop.

"When I was new, it was the best time of my life. I got to go out there and wear a white hat and help people and make a difference in my community, one little piece at a time," Ball says. "That's a very, very fulfilling thing to do."

This is real police work. On one occasion, Ball had to pull his gun on a guy threatening a woman with a knife.

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What makes a great teacher great? That's the question at the heart of 50 Great Teachers, from the NPR Ed Team.

Diana Agrest believes architecture is so much more than a marriage of form and function. For more than four decades, she's been trying to get her students to believe that too.

Bird flu has been striking chicken and turkey farms in parts of the West and Midwest. This past week, it hit a flock of millions egg-laying chickens in northeastern Iowa. Update 4/22/2015: The USDA now says that around 3 million birds were affected in the Iowa facility — down from a previous estimate of 5 million.

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Fifty years ago this week, a chemist in what is now Silicon Valley published a paper that set the groundwork for the digital revolution.

You may never have heard of Moore's law, but it has a lot do with why you will pay about the same price for your next computer, smartphone or tablet, even though it will be faster and have better screen resolution than the last one.

In 2009, I was among the scrum of reporters covering the controversial advice from the U.S. Preventive Services Task Force that women in their 40s think twice about regular mammograms. The task force pointed out that the net benefits in younger women were small and said women should weigh the pros and cons of screening before making a decision.

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Transcript

ROBERT SIEGEL, HOST:

Copyright 2015 NPR. To see more, visit http://www.npr.org/.

Transcript

ROBERT SIEGEL, HOST:

The U.S. Supreme Court hears legal arguments next week in the legal battle over same-sex marriage. It's an extraordinarily high-stakes clash, but the men and women at the center of it see themselves as incredibly ordinary. The 12 couples and two widowers include doctors, lawyers, an Army sergeant, nurses and teachers.

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