CNN Radio News Day: April 17, 2013
FBI crime scene investigators continue to work the scene of two bomb explosions at the finish line of the Boston Marathon.
April 17th, 2013
04:53 PM ET

CNN Radio News Day: April 17, 2013

CNN Radio News Day is an evening news program providing an informative, thoughtful and creative look at the day's events. It's posted Monday through Friday at 4:30 pm ET.

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(CNN) – Welcome to CNN Radio News Day.

  • Police and the FBI have been feverishly sifting through thousands of photos and hundreds of hours of video from Monday's terrorist attack on the Boston Marathon, and today comes word that their hard work is paying off. Authorities tell CNN they want to question a man who was seen, on video, wearing a white baseball cap, a light-colored hooded sweatshirt, and a black jacket. Boston Mayor Thomas Menino was briefed on the evidence:

"They have more videos on this one than any case the FBI ever had. Especially across from Lord & Taylor where the bombing, second bombing, happened. They have direct camera right on the location." FULL POST

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Perfect Timing: Los Angeles synchronizes all of its 4400 traffic signals
Los Angeles synchronizes 4400 traffic signals on its 7000 surface streets.
April 17th, 2013
02:45 PM ET

Perfect Timing: Los Angeles synchronizes all of its 4400 traffic signals

By Jim Roope, CNN

Follow on Twitter: @JimRoopeCNN

Editor's Note: Listen to the full story in our player above, and join the conversation in our comments section below.

(CNN) – Take a ride with me on a major thoroughfare in Los Angeles. The city's mayor, Antonio Villaraigosa, just announced that all 4400 traffic signals along all 7000 public roadways are synchronized.

We wanted to find out exactly what that means for drivers.

[1:24] “I’m kind of ashamed to admit this but I think traffic lights are incredibly cool.”

USC engineering professor James Moore said traffic signals never reduce delay:

[2:03] “You use traffic signals to ensure that all movements are accommodated." FULL POST

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Filed under: Behavior • Science • Soundwaves • Stories