Police officers walk past the Washington Convention Center in Washington, D.C., on Saturday, where security is tightening ahead of the Nuclear Security Summit. Jewel Samad/AFP/Getty Images hide caption

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Nuclear Summit Takes Urgent Tone
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Gas centrifuges used to produce enriched uranium sit in a plant in Piketon, Ohio, in 1984. The technology for laser-based enrichment is much smaller than technology using centrifuges, and would be easier to secretly develop for weapon production. Wikimedia Commons hide caption

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Laser Nuclear Technology Might Pose Security Risk
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Bleed Subthunk
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Match Subthunk
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Kiss My Axe Meola, Al Di Project
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The Hour of Two Lights Terry Hall Mushtao
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Sure they're pretty, but flowers — as well as trees and grasses — release huge amounts of pollen, which isn't great news for pollen-allergy sufferers. For asthmatic kids, these allergies may further aggravate symptoms such as wheezing. hide caption

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How Tackling Allergies Can Ease Asthma Suffering
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Suite No. 1 in G Major Yo-Yo Ma
Suite No. 1 in G Major--GIgue Yo-Yo Ma
BT Joshua Bell and Edgar Meyer with Sam Bush and Mike Marshall
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The Falcon Will Fly Again Nobukazu Takemura

Family, friends and fellow ranchers lined up at the high school field house in Douglas, Ariz., to attend the funeral of Robert Krentz, who was found shot to death on his ranch along the Mexico border last month. Ted Robbins/NPR hide caption

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Ariz. Ranchers Caught Up In Mexican Drug Violence
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Sweet Emotion Mike Gordon and Leo Kottke
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A young woman lights a candle among hundreds of others left by mourners outside the Presidential Palace in memory of late Polish President Lech Kaczynski on Monday in Warsaw, Poland. Sean Gallup/Getty Image hide caption

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Poles Question Why Delegation Used An Old Plane
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Koriome [Instrumental] Markus James
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Milestones Herbie Hancock
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Dolphin Dance Herbie Hancock
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Sandstorm Kareem Roustom
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Burnt Onions Kareem Roustom
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Sezen Aksu, a superstar in Turkey, writes lyrics that capture the muddle of human emotion. courtesy of the artist hide caption

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Sezen Aksu: The Voice Of Istanbul
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Fiesta Farzad
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