The two suspects in Monday's deadly Boston Marathon explosions and the Thursday night murder of a police officer at the Massachusetts Institute of Technology are brothers from a former Soviet republic who were in the United States legally for years and lived together in a Cambridge, Mass., apartment.

What happens when scientific research borders on science fiction? Michael Belfiore, author of the new book The Department of Mad Scientists, talks about the bizarre projects happening behind the scenes at DARPA — the secretive research arm of the Department of Defense.

Authorities in the Boston area are searching for a suspect in Monday's bombings at the Boston marathon. David Greene and Steve Inskeep talk to NPR's Tom Gjelten and Fred Bever of member station WBUR for a status update.

David Greene talks to NPR's Ari Shapiro to find out what President Obama has doing with the information regarding the Boston Marathon Case. And, Joseph Shapiro talks to Maret Tsarnaeva, of Toronto, who says she is the aunt of the two bombing suspects, Tamerlan Tsarnaev and Dzhokhar Tsarnaev.

FBI and SWAT teams are trying to locate a suspect in Monday's bombing at the Boston Marathon. The other suspect, his brother, was killed earlier in a shootout with police. Dr. David Schoenfeld of Beth Israel Hospital talks about Thursday night's police action in Watertown.

NPR's Tom Gjelten has an update for Morning Edition listeners on the Boston Marathon bombing Case. Steve Inskeep also talks to Robin Young, host of Here & Now from member station WBUR, about one of the bombing suspects.

Steve Inskeep and David Greene get an update on the Boston Marathon bombing case from NPR's Jeff Brady. Commenting on the suspects is Matt Rojansky, deputy director of the Russia and Eurasia program at the Carnegie Endowment for International Peace.

The scene in suburban Boston early Friday was chaotic. Police were going house to house in Watertown as they searched for "suspect No. 2" in the bombings.

Fast breaking developments in the marathon bombing manhunt put the city of Boston on lockdown. Host Michel Martin checks in with Boston resident Neil Minkoff, and gets perspective on keeping a major city safe during a manhunt from former London police official, Brian Paddick.