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Mali is in political crisis after a coup d'etat in March that toppled the president and drove him into hiding. An Islamic rebel group has taken control of the north of Mali. NPR foreign correspondent Ofeibea Quist-Arcton discusses the rapidly changing situation from the capital city Bamako.

Bike lanes accommodate cyclists and help with visibility, and some people view the lanes as a way to facilitate urban transportation. But sharing the road has its challenges. Drivers bristle at the thought of losing parking spaces, and drivers and pedestrians both worry about reckless riders.

2011 brought exceptionally mild winters in most of the U.S., deadly tornadoes in the Midwest and extended drought in the West and Southwest. Kevin Trenberth, distinguished senior scientist at the National Center for Atmospheric Research, discusses the correlation between climate change and extreme weather.

The prosecutor investigating the shooting of Trayvon Martin in Sanford, Fla., has not yet decided if she will bring charges against the shooter, George Zimmerman.

It took several weeks for the Feb. 26 shooting to draw the nation's attention — after Benjamin Crump, the attorney for Trayvon Martin's family, launched a campaign to get the case before media and civil rights activists nationwide.

Two days after the shooting, the high-profile civil rights attorney started getting calls about the case. "My phone was buzzing," Crump says.

A Russian computer security firm says it has discovered that about 600,000 Apple computers have been infected with a "Flashback Trojan" virus.

Now, before we move on, you should know that the company making the announcement is Dr. Web, which sells anti-virus software that will protect a computer against that kind of virus. It's also important to note that many of the parties weighing in are part of a security community that makes money off selling anti-virus software.

Tonight, in Whitesville, W.Va., mourners will silently walk with candles on sidewalks lined with luminary lights to remember the 29 coal miners who died two years ago today in the nation's worst mine disaster in 40 years.

That memorial will follow a 3 p.m. ET event in Beckley,W. Va., where an honor guard will ring a bell 29 times to mark the moment the Upper Big Branch coal mine erupted in a massive explosion.

Host Michel Martin remembers American artist Elizabeth Catlett, who died this week at the age of 96. Catlett is known for integrating social justice activism in sculptures and prints. That activism caught the eye of the U.S. government at the height of McCarthyism. For years, she was banned from entering the U.S. from her adopted home of Mexico.

Transcript

MICHEL MARTIN, HOST:

I'm Michel Martin and this is TELL ME MORE from NPR News. Coming up, we'll check out more listener tweets as part of our Muses and Metaphors series.

But first, our Wisdom Watch conversation. That's where we talk with those who've made a difference through their work. And you might have caught our next guest on "Dr. Phil" or BET, or perhaps you've picked up one of his bestselling books or seen one of his many DVDs or movies.

As part of Tell Me More's series for National Poetry Month, host Michel Martin shares a poetic tweet from Jim Lounsbury of Sydney, Australia. He is a writer and filmmaker who listens to NPR on his iPhone. Listeners are invited to tweet original poems of 140 characters and less to #TMMPoetry.

Dennis Walcott oversees a school system with more than one million students. Graduation rates are below the national average, and studies suggest most of the city's high school graduates are not ready for college. But Chancellor Walcott tells host Michel Martin that, after one year on the job, New York City schools are on the mend.