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The investigation into the Boston Marathon bombing continues. Investigators have spoken with the parents of the suspects in Russia. Audie Cornish talks to Dina Temple-Raston about the latest developments.

Scientists have discovered what may be an important new risk factor for heart disease. And here's the surprising twist: The troublesome substance seems to be a waste product left behind by bacteria in our guts as they help us digest lecithin — a substance plentiful in red meat, eggs, liver and certain other foods.

Doctors say the research further illustrates the complicated relationship we have with the microbes living inside us, and could lead to new ways to prevent heart attacks and strokes.

In the days since the Boston Marathon bombings, local law enforcement officials have been given high marks for their response to the attack and the coordination among numerous federal, state and local agencies involved.

But at the same time, questions are being raised about the coordination among federal agencies handling intelligence they had about the suspects in the months before the attack.

The Code Switch team loves thinking, talking and hearing about language and linguistics — see our launch essay, "When Our Kids Own America," and "How Code-Switching Explains The World." So we wanted to share this report from NPR's Arts Desk that's about the use of "yo" as a gender-neutral pronoun.

This is the sixth week of the trial of Dr. Kermit Gosnell, the physician charged with five counts of murder in the deaths of a woman and infants at the Philadelphia abortion clinic he owned and operated.

President Obama's time in office has not been defined by terrorism as President George W. Bush's was. Yet incidents like the one in Boston have been a regular, painful through line of his presidency.

When a new administration walks into the White House, nobody provides a handbook on how to respond to a terrorist attack. So the Obama administration has been on a steady learning curve.

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ROBERT SIEGEL, HOST:

From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.

AUDIE CORNISH, HOST:

And I'm Audie Cornish.

Mysterious new developments in Mississippi today in the case of poisoned letters sent to President Obama, a U.S. Senator and a Mississippi judge. Federal authorities are dropping charges against a man arrested last week in connection with the case.

NPR's Debbie Elliott has an update for us. And, Debbie, to start, the initial suspect, Paul Kevin Curtis, is actually free tonight. What happened in this case?

As Congress continues its debate over immigration reform, nearly a half-million young people who are in the U.S. illegally have already applied for deferred action.

The Obama administration started the policy, formally known as Deferred Action for Childhood Arrivals, last year for people who were brought into the U.S. illegally as children. Those who are approved gain the right to work or study and avoid deportation for two years.

The U.S. Supreme Court has ruled that a longtime legal resident of the United States was improperly deported for possession of a small amount of marijuana. By a 7-2 vote, the justices said that it defies common sense to treat an offense like this as an "aggravated felony" justifying mandatory deportation.

As investigators look into the Boston Marathon bombings, one crucial question is whether the suspects, brothers Tamerlan and Dzhokhar Tsarnaev, acted alone or had help. The clues might be found in the bombs used.

From what is now known, it appears the brothers assembled a whole arsenal of explosives. Watertown Police Chief Edward Deveau told CNN last weekend that the suspects had at least six bombs, including the two used in the attack and one thrown at police during a shootout.

More online retailers would have to collect sales tax under a bill making its way through the U.S. Senate this week. The measure won strong bipartisan backing on a procedural vote Monday, and President Obama has said he would sign it.

The political battle over the bill pits online retailers against brick-and-mortar stores — and, in some cases, against other online sellers.

Footage from surveillance cameras along the Boston Marathon route gave the FBI early clues about the bombing suspects. And prosecutors say they'll use some of those images to try to prove their criminal case against 19-year-old Dzhokhar Tsarnaev. But the proliferation of cameras in America's big cities is raising some tricky questions about the balance between security and privacy.

It was pictures of two brothers taken by a camera outside the Lord & Taylor department store that provided the first glimpse of the men who allegedly bombed the Boston Marathon.

A Twitter account from The Associated Press was hacked Tuesday afternoon and the erroneous message — to be perfectly clear, it WAS NOT TRUE — sent stocks down sharply for a few moments.

The false message claimed there had been two explosions at the White House and that President Obama had been injured. Again, none of that happened.

Transcript

ROBERT SIEGEL, HOST:

From NPR News, this is ALL THINGS CONSIDERED. I'm Robert Siegel.

AUDIE CORNISH, HOST:

And I'm Audie Cornish. If he had done nothing else, Richie Havens would have had a secure place in American music history as the performer who opened Woodstock, on Aug. 15, 1969.

(SOUNDBITE OF ARCHIVED RECORDING

RICHIE HAVENS: (Singing) Freedom, freedom, freedom, freedom, freedom, freedom, freedom, freedom...

Robert Redford's new movie, The Company You Keep, draws on a turbulent time in recent history: Forty years ago, there was a violent faction of SDS, the Students for a Democratic Society, that was known as the Weather Underground. It turned from organizing marches and sit-ins against the war in Vietnam to planting bombs — and in one case robbing a bank truck and killing a guard.

Around the turn of the 19th century, before he became Britain's revered prime minister, a young Winston Churchill found himself in South Africa. He was serving in the Army and as a war correspondent covering the Boer War.

One day, he put a blue pencil to army-issued notepaper and conveyed his thoughts about the conflict in a 40-line poem. More than a century later, "Our Modern Watchwords" was discovered by a retired manuscript dealer.

Host Jacki Lyden speaks with Craig Silverman of the Poynter Institute about the problematic media coverage of the Boston bombings and other breaking news events. He discusses how journalists can avoid the all-too-common pitfalls when reporting on a developing story.

Before Amy Speace embarked on a career in music, the stage called her name. That's a good fact to keep in mind when listening to the actor-turned-folk singer's latest album, How to Sleep in a Stormy Boat.

NPR's Daniel Zwerdling reports on what's known about the two brothers suspected in the Boston Marathon bombing, Dzhokhar and Tamerlan Tsarnaev.