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The news that U.S. scientists have successfully cloned a human embryo seems almost certain to rekindle a political fight that has raged, on and off, since the announcement of the creation of Dolly the sheep in 1997.

The NBA's New York Knicks lost to the Indiana Pacers Tuesday night, falling further behind in their playoff series. Knicks shooting guard J.R. Smith took responsibility. A new Twitter account followed each shot he took.

Police in Kentucky say Trevor Runyon slipped into a supermarket and waited for it to close.Surveillance cameras show he then had a feast. He cooked and ate six steak, and washed them down with beer, shrimp and birthday cake. Police found him hiding in the ceiling.

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DAVID GREENE, HOST:

It has been one month since two bombs rocked the finish line of the Boston Marathon, killing three people. Families of those killed continue to mourn their loved ones; and dozens of the more than 260 people injured continue their rehabilitation, many of them amputees who are now relearning to walk.

Meantime in Boston, all but one business has reopened. But as NPR's Tovia Smith reports, the city continues a slow and painful recovery.

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In an NPR interview, Attorney General Eric Holder answers questions about the IRS's processing of tax-exemption applications, the Justice Department's subpoenas for reporters' phone records and other hot issues. Holder faces questions on Capitol Hill Wednesday during an oversight hearing.

Tea Party activists are calling for a full investigation, and possibly lawsuits, following revelations that the Internal Revenue Service flagged so-called patriot groups for extra scrutiny in applications for federal tax-exempt status.

Among those claiming unjust and unconstitutional targeting by the IRS is a group called TheTeaParty.net, which bills itself as the largest grass-roots conservative Tea Party organization in the country.

Americans are repeatedly told to cut back on salt to reduce the risk of heart disease. But there are new questions being raised about the possible risks of reducing sodium too much.

So, how low should we go? Currently, the government recommends that Americans should aim for 2,300 milligrams per day. And people older than 50, as well as those with high blood pressure, diabetes or kidney disease are advised to reduce sodium even further, down to 1,500 mg per day.