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"Office hours are some of my favorite hours of the week," says professor Tom Carlson, a medical doctor, ethnobotanist and instructor of 1700 students annually at the University of California, Berkeley. One of Carlson's former students, SciFri associate senior producer Christopher Intagliata, says Carlson's class got him on the path toward science. In this "Teacher Feature," Intagliata tells his former teacher what the class meant to him.

For the annual Quiet Music Festival of Portland, which begins today, the goal is to celebrate calming sounds. The festival gained fame after the show Portlandia featured a Battle Of The Gentle Bands.

The coffee chain says it will enforce its no-smoking rule at its outdoor seating areas and within 25 feet of store entrances. So, no coffee and a smoke for those who enjoy them together. Have smoking bans gone too far or not far enough?

New technology is changing the way cities are run, with cutting-edge urban innovations around the globe. Sprawling, chaotic Rio de Janeiro has built a state-of-the-art operations center as it gears up for two major events.

Mastectomies have become increasingly popular for women with breast cancer. That's a big turnaround from the 1980s, when women abandoned mastectomy in favor of breast-saving lumpectomy.

Some Democrats might snicker at Mitt Romney's desire to be involved in the 2014 midterm election campaigns. While there are limits to his usefulness as a campaigner, he could have an upside for Republicans as a fundraiser.

In light of the recent tornadoes that devastated Oklahoma, guest host Wade Goodwyn talks to author Lee Sandlin about the myths and practices of tornado preparedness over the decades. Sandlin is the author of Storm Kinds: The Untold History of America's First Tornado Chasers.

Guest host Wade Goodwyn speaks with James Fallows, national correspondent with The Atlantic. This week, they break down Minnesota Rep. Michele Bachmann's decision not to run for re-election. Plus, a look ahead to President Obama's meeting with Chinese President Xi Jinping.

As Edith, Stapleton took on the thorniest of social issues, from race to feminism. She said that humor had a way of reducing intolerance to nothing.

The government appeared to want to placate them, but the protesters ignored calls to end the demonstrations.