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There are so many fish in the sea. But from a diner's viewpoint, peering down at a sliver of white fish atop a bed of sushi rice, a lot of them look the same.

Sicily's Mount Etna has been blowing off steam, and lava, this week. NASA's Earth Observing-1 (EO-1) satellite flew over it on Wednesday and took an image that "combines shortwave infrared, near infrared, and green light in the red, green, and blue channels."

Frustration over a change in federal copyright policy that makes it illegal to unlock new cellphones has resulted in more than 100,000 signatures on a petition at the White House's website, meaning the executive branch must now respond to calls to rescind the ruling or "champion a bill that makes unlocking permanently legal."

Fifteen Republican senators sent a letter to President Obama asking him to withdraw the nomination of former Republican Sen. Chuck Hagel to be secretary of Defense.

The senators pointed to his lackluster performance during his confirmation hearing as well as what they said were his untenable positions on Iran.

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JENNIFER LUDDEN, HOST:

This is TALK OF THE NATION. I'm Jennifer Ludden in Washington; Neal Conan is away. Religious exemptions have been in the news a lot lately. The Obama administration has revised its rules on insurance coverage to accommodate religious nonprofits. If the proposal sticks, they won't have to pay for coverage of birth control for employees.

Several explosions ripped through Damascus on Thursday morning in what was one of the deadliest days in the Syrian capital since the uprising began nearly two years ago.

A huge blast in the al-Mazraa neighborhood was the work of a suicide car bomber, according to media reports. More than 50 people were killed and more than 200 injured, according to both the Syrian state media and opposition groups.

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JENNIFER LUDDEN, HOST:

Human ears, gun parts, bars of chocolate, musical instruments, robots - just a few of the things that have recently been created from scratch by 3-D printers. Apparently and amazingly, you just put in the materials, upload a design and press start. My printer doesn't even work with just old paper and ink. But we'll hear more about this potential. The possibilities seem endless. Some believe 3-D printing will revolutionize manufacturing, but the technology is also raising thorny questions about copyright and regulation.

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JENNIFER LUDDEN, HOST:

This is TALK OF THE NATION. I'm Jennifer Ludden, in Washington. Neal Conan is away. For same-sex military couples, a lot has changed since the end of "don't ask, don't tell." Just last week, Defense Secretary Leon Panetta announced a list of benefits that will now or soon apply to the same-sex partners of service members.