In the early days of the NFL, the average lineman weighed 190 pounds. Now they average 300 pounds. A look at the physics behind a tackle shows that bigger and faster players means harder slams to the turf and more severe injuries.

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In the early days of the NFL, the average lineman weighed 190 lbs. Now they average 300 lbs. A look at the physics behind a tackle shows that bigger and faster players means harder slams to the turf and more severe injuries.

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The winter may not be over, but economists are looking to spring for good news when it comes to jobs. Host Michel Martin speaks with NPR Senior Business Editor Marilyn Geewax about whether a strengthening housing market could boost stalling jobs numbers.

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President Obama recently backed proposals by the "Gang of Eight" senators to overhaul the nation's immigration system. Host Michel Martin takes a look at how some border towns could be affected. She speaks with Scott Smith, the Republican mayor of Mesa, Arizona, and David Coss, the Democratic mayor of Santa Fe, New Mexico.

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Congress passed an emergency aid package for Superstorm Sandy victims earlier this week. But three months after the storm, many hard-hit neighborhoods are still suffering. Host Michel Martin checks back with Monsignor John Brown of St. Francis de Sales in Rockaway, Queens, to discuss how the community is recovering.

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Chu, who won the Nobel Prize in Physics in 1997, said he will return to academia. President Obama said that during his tenure Chu moved the United States "towards real energy independence."

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Some organizations have objected to the health care overhaul's rules, saying they violate religious freedom.

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The economy shrank slightly at the end of 2012, and the unemployment rate ticked up in January. But this spring's data could look much brighter if the housing market continues to heat up as expected. That's because the sector supports a variety of jobs, ranging from bricklayers to appliance manufacturers.

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In his book Glock: The Rise of America's Gun, Paul Barrett traces how the sleek, high-capacity Austrian weapon found its way into Hollywood films and rap lyrics, not to mention two-thirds of all U.S. police departments.

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Malted wheat and barley add flavor and heft to most beers, but they also contain gluten, making beer off limits for people with celiac disease and gluten sensitivity. For those looking for gluten-free options for Super Bowl Sunday and beyond, good news: There are more choices than ever before for flavorful, full-bodied gluten-free beer.

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Malted wheat and barley add flavor and heft to most beers, but they also contain gluten, making beer off limits for people with celiac disease and gluten sensitivity. For those looking for gluten-free options for Super Bowl Sunday and beyond, good news: There are more choices than ever before for flavorful, full-bodied gluten-free beer.

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Nobody knows exactly how many jobs the economy added (or lost) last month. Here's how to make an educated guess.

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Spoiler alert: A few Super Bowl commercials have launched on social media well before Sunday's big game. Ad industry watchers say the multi-million-dollar spots are meant to be entertaining, but a few of the ads are already controversial.

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Spoiler alert: A few Super Bowl commercials have launched on social media well before Sunday's big game. Ad industry watchers say the multi-million-dollar spots are meant to be entertaining, but a few of the ads are already controversial.

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Most medical schools have cut down on students' interactions with the pharmaceutical industry by instituting gift restriction policies. These policies can reduce the prescribing of newly marketed drugs in favor of cheaper options.

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