Morning Edition

Explosions rocked the finish line of the Boston Marathon one month ago. Four Boston-area families continue to mourn their loved ones and dozens of the 250 injured push on with their rehab. In the area of the bombing, only one business has not reopened.

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.