NPR News

The SciFri Book Club is touring the solar system, with Dava Sobel's 2005 The Planets. Call in with a review of the book. Plus Jim Green, director of planetary science at NASA, joins the club to give an update on what's happened planet-wise since the book was published.

Reporting in Science Translational Medicine, researchers write that neural stem cell implants were able to slow the onset of amyotrophic lateral sclerosis (ALS), or Lou Gehrig's disease, in mice. Study author Evan Snyder discusses the stem cells' protective effect, and why human trials may not be far behind.

In the wake of the tragedy in Newtown, Conn., mayors are a key part of the debate over the country's gun laws. Host Michel Martin speaks with two leaders who frequently encounter issues of gun violence and gun ownership; Kansas City, Mo. Mayor Sylvester James and former Cincinnati Mayor Kenneth Blackwell.

America's increasingly diverse society is rewriting many of the traditional rules of etiquette. Host Michel Martin gets tips from etiquette experts Harriette Cole, Phillip Galanes, and social commentator Firoozeh Dumas.

Transcript

STEVE INSKEEP, HOST:

It's MORNING EDITION, from NPR News. I'm Steve Inskeep.

DAVID GREENE, HOST:

And I'm David Greene. This afternoon, President Obama is set to nominate Massachusetts Senator John Kerry as the nation's next secretary of state. Kerry would replace Hillary Clinton, who's planning to leave that post after four years as the president's globe-trotting emissary. Joining us to talk about the move is NPR White House correspondent Scott Horsley; and NPR's diplomatic correspondent Michele Kelemen, who's here in the studio with me.