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President Obama answers questions during his news conference at the White House on Tuesday. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

Tulip Courtesy of Benjamin Swett hide caption

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Courtesy of Benjamin Swett

American farms like this iceberg lettuce field owned by Duda Farm Fresh Foods outside Salinas, Calif., are facing a dwindling supply of farmworkers from rural Mexico. Kirk Siegler hide caption

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Kirk Siegler

Gov. Jerry Brown in January calls for federal judges to return control of California prisons to the state. This month, a federal appeals court denied Brown's request and ordered the state to reduce its prison population immediately. Rich Pedroncelli/AP hide caption

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Rich Pedroncelli/AP
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Criminologist Believes Violent Behavior Is Biological

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