All Things Considered

The idea of exploiting the natural resources on asteroids has been around for more than a century. But a new company called Planetary Resources has the financial backing of some big names in high tech, and hopes to launch specially-designed prospecting spacecraft within two years.

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ROBERT SIEGEL, HOST:

The Mexican-born population of the United States is huge, 12 million. And a little over half of that is people who are unauthorized, they're here illegally. Well, now a new study from the Pew Hispanic Center reports that after rising for many years, the number of Mexicans coming to the U.S. is now roughly equal to the number of Mexicans migrating away from the U.S., back to Mexico. In short, net migration has fallen to zero.

Pew finds several causes for that decline: Mexican demographics, the U.S. economy, U.S. border enforcement.

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ROBERT SIEGEL, HOST:

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

MELISSA BLOCK, HOST:

And I'm Melissa Block.

President Obama toured the U.S. Holocaust Museum in Washington today joined by Holocaust survivor, author and Nobel Laureate, Elie Wiesel. Mr. Obama said the U.S. must never again allow such atrocities to take place.

As NPR Don Gonyea reports, the president also announced new tools to punish countries that use technology to track and target their citizens.