The tragic deaths of 29 coal miners in a massive explosion in 2010 have provided new evidence of a resurgence of the disease known as black lung.

T-shirts will surely be made:

Along with draft rules for how to become a licensed grower or seller of marijuana, the Washington State Liquor Control Board this week released the official "icon logo" that will need to be put on packages of pot and "marijuana-infused products sold at retail."

There's a lot to love about biking to work: the exercise, the fresh air, the cost savings and the benefits for the environment.

But does it make you healthier?

That's a question that's not as easy to answer as you might think. But since today is Bike to Work Day, we'll give it a try.

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CELESTE HEADLEE, HOST:

And now, it's time for BackTalk. That's where we lift the curtain on what's happening in the TELL ME MORE blogosphere. Editor Ammad Omar is with us.

So, Ammad, what's going on today?

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CELESTE HEADLEE, HOST:

I'm Celeste Headlee. This is TELL ME MORE from NPR News. Michel Martin is away and it is time yet again for a visit to the Barbershop. That's where the guys talk about what's in the news, what's on their minds.

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CELESTE HEADLEE, HOST:

I'm Celeste Headlee and this is TELL ME MORE from NPR News. Michel Martin is away. Coming up, we go to Ohio where black business owners are meeting to swap some new ideas. Basketball legend Magic Johnson even got a lead on an investment there. We'll tell you more about that in just a few minutes. But first, House Republicans voted yesterday to repeal President Obama's signature healthcare law - again.

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CELESTE HEADLEE, HOST:

From teens with drive, we turn now to young people who have no interest in driving. This is National Bike to Work Day, and a substantial number of millennials choose bikes or public transportation or their feet to get around instead of cars. That's according to the U.S. Public Interest Research Group, or PIRG, which concluded that the 20th century driving boom is over.

Paul Eisenstein has written about this trend. He's the editor of TheDetroitBureau.com, and he joins me now. Welcome.

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CELESTE HEADLEE, HOST:

This is TELL ME MORE, from NPR News. Michel Martin is away. I'm Celeste Headlee. Coming up, it's National Bike to Work Day, but many millennials prefer two wheels to four. Why more 20-somethings are driving less. That's just ahead.

In Brilliant Blunders: From Darwin to Einstein, astrophysicist Mario Livio explores the colossal errors committed by scientific greats, from chemist Linus Pauling's botched model of DNA, to Charles Darwin's failure to understand genetics--the very mechanism of natural selection.

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IRA FLATOW, HOST:

Flora Lichtman is here with our video pick. Flora, you have the next installment in our Desktop Diaries series in which you get to know scientists by asking them about their desk trinkets.

FLORA LICHTMAN, BYLINE: That's right.

FLATOW: And who do we have today?