The Education Department has launched an investigation into discipline rates in Seattle public schools.

Students of color have long been punished in far higher numbers than white students in Seattle, but now the department's Office for Civil Rights is looking at whether black students are disciplined more frequently and more harshly than white students for the same behavior.

Who knew that the flower nectar of citrus plants — including some varieties of grapefruit, lemon and oranges — contains caffeine? As does the nectar of coffee plant flowers.

And when honeybees feed on caffeine-containing nectar, it turns out, the caffeine buzz seems to improve their memories — or their motivations for going back for more.

"It is surprising," says Geraldine Wright at Newcastle University in the the U.K., the lead researcher of a new honeybee study published in the journal Science.

On Wednesday, Sen. Rand Paul launched into a filibuster on the floor of the Senate, against John Brennan's nomination as CIA director. Paul, who said "I will speak until I can no longer speak," lasted for nearly 13 hours. It was an impressive length of time, but it didn't come close to Sen. Strom Thurmond's record-holding filibuster against the Civil Rights Act of 1957, which surpassed 24 hours. Melissa Block speaks with Senate historian Donald Ritchie about the colorful history of the talking filibuster.

President Obama continued his outreach to congressional Republicans on Thursday with a lunch with Rep. Paul Ryan of Wisconsin, chairman of the Budget Committee and author of a plan to balance the budget in a decade.

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It's ALL THINGS CONSIDERED from NPR News. I'm Audie Cornish.

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And I'm Melissa Block. The city of Plainview, Texas has been a center of the cattle industry for decades. But a few weeks ago, after more than 40 years in operation, Plainview's beef processing plant shut its doors. Plant owners blame years of drought and the dwindling supply of cattle. As Mose Buchele reports from member station KUT, the closure could be a preview of things to come for the Texas plains.

The U.N. Security Council agreed to tighten sanctions against North Korea on Thursday as punishment for its recent nuclear test. The Council's unanimous agreement came after three weeks of negotiation between the U.S. and China, which has opposed such measures in the past. North Korea was furious at the U.N. action, issuing a threat to attack the U.S. with nuclear weapons as the sanctions came up for a vote.

The Senate easily confirmed the nomination of John Brennan as CIA director, that following the dramatics of Sen. Rand Paul, who filibustered against it for nearly 13 hours on Wednesday night. Is this the dawn of a new era of these, old-school, "talking" filibusters? Tamara Keith talks to Audie Cornish.

The first major gun bills in nearly two decades had their first hearing in the Senate on Thursday, including an assault weapons ban and a ban on so-called "straw purchases." Still, even in the aftermath of the shootings in Newtown, Conn., the legislation faces an uphill battle. Ailsa Chang talks to Melissa Block.