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Authorities in Mexico City said Friday morning that at least 32 people had been killed and another 120 or so injured by the explosion Thursday afternoon at the headquarters of Pemex, Mexico's state-owned oil company.

There was an explosion Friday at an entrance to the U.S. embassy in Ankara, Turkey, and within hours American officials were calling it a "terrorist attack."

Ed Koch, the colorful three-term mayor who led New York City through its financial crisis in the '70s, has died.

George Arzt, a spokesman for the former mayor, tells NPR's Joel Rose that Koch died of congestive heart failure around 2 a.m. ET Friday. The former mayor was 88.

This week saw the end of a years-long, international, multi-billion-dollar battle over one of the most boring things in finance: savings accounts.

At the center of the battle was Iceland, a tiny country where the banks grew into international behemoths during the credit bubble.

The banks got so big partly by convincing foreigners to open up online savings accounts. In particular, lots of people in England and Netherlands opened up "ICESAVE accounts" with a bank called Landsbanki. During the financial crisis, the bank collapsed.

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RENEE MONTAGNE, HOST:

And now to Google, which is looking for some hackers to ride to the top in an unusual competition. Our last word in business is: pi contest, as in 3.14.

STEVE INSKEEP, HOST:

Three point one four, that's the amount in millions of dollars that Google is offering in what its Podium Hacking Contest. The challenge here is to hack the Google Chrome operating system and expose security flaws.

Travis McCoy is the product manager for Chrome and we asked him why pi.

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RENEE MONTAGNE, HOST:

The Baltimore Ravens are the underdogs in this Sunday's Super Bowl, going up against the San Francisco 49ers. Now, there have been bigger underdogs. And yes, the Ravens are not the lowest-seeded team to make it to the Super Bowl. But the Ravens have beaten the odds in another way. NPR's Mike Pesca talked to some football numbers guys and has this report.

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RENEE MONTAGNE, HOST:

One of the most entertaining documentaries to come out of this year's Sundance Film Festival is "Sound City." The rock musician David Grohl of the band Foo Fighters is the director, a first for him. Los Angeles Times and MORNING EDITION film critic Kenneth Turan has this review.

KENNETH TURAN, BYLINE: "Sound City" is a mash note to a machine - not just any machine, however, but one that helped change the face of rock and roll.

(SOUNDBITE OF MUSIC)

Hillary Clinton leaves her job Friday as secretary of state with sky-high approval ratings, and there's already a superPAC established urging her to run for president in 2016.