This interview was originally broadcast on Aug. 22, 2012.

Comedian Bill Hader is adept onstage and doing live TV. But he's scared to death of standup.

He remembers watching Chris Rock's 1996 HBO special, Bring the Pain, and thinking, "I don't know how people do that."

"I need a character," Hader tells Fresh Air's Terry Gross. "I need people out there with me."

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:

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.

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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.

A report from the UN Food and Agriculture Organization says insects offer a huge potential for improving the world's food security. Peter Menzel, co-author of Man Eating Bugs, describes some insect-based cuisine and the western aversion to creepy-crawly snacks.

Scientists reported this week in the journal Cell that they had used somatic cell nuclear transfer techniques to create a source of embryonic stem cells from the skin cells of a patient. George Daley, director of the stem cell transplantation program at Boston Children's Hospital, and Josephine Johnston of the Hastings Center discuss the research.

Generations of physicists have claimed that time is an illusion. But not all agree. In his book Time Reborn: From the Crisis in Physics to the Future of the Universe, theoretical physicist Lee Smolin argues that time exists--and he says time is key to understanding the evolution of the universe.