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Christine Porter is hooked on the MyFitnessPal app. In October, after deciding to lose 50 pounds, Porter started typing in everything she eats, drinks and any exercise she gets.

"This is my main page here," says Porter. "It's telling me I have about 1,200 calories remaining for the day. When I want to record something I just click the 'add to diary' button. I'm on it all day either through my phone or through the computer."

She says she's lost 42 pounds in nine months.

National Security Agency director Keith Alexander returned to the Hill on Tuesday, this time to testify before a House intelligence committee about the NSA spying revelations. Alexander said the programs in question foiled 50 terrorist plots, including one against the New York Stock Exchange.

In the past decade, Mexico's tech industry has flourished, growing three times faster than the global average. Most of that growth has been fueled by demand from the United States. But as Mexico's startups strive to make it in foreign markets, they say they need more engineers and ways to finance their growth.

Transcript

JOHN DONVAN, HOST:

Singer Cécile McLorin Salvant was born in Miami to French and Haitian parents, and started singing jazz while living in Paris. Back in the U.S., she won the Thelonious Monk vocal competition in 2010. The 23-year-old's first album, WomanChild, is now out — and few jazz debuts by singers or instrumentalists make this big a splash.