A tornado forms over I-40 in Midwest City, Okla., during rush hour on Friday. Alonzo Adams/AP hide caption

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New York this week became the latest major city to launch a bike-share program. Craig Ruttle/AP hide caption

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Turkish protestors and riot policemen clash on Saturday, during a protest against the demolition of Taksim Gezi Park, in Taksim Square in Istanbul. Bulent Kilic/AFP/Getty Images hide caption

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Streets flooded in the Staten Island borough of New York after Superstorm Sandy hit in October. The storm caused multiple fatalities, halted mass transit and cut power to more than 6 million homes and businesses. John Minchillo/AP hide caption

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The Interstate 5 bridge over the Skagit River in Mount Vernon, Wash., collapsed last week. Elaine Thompson/AP hide caption

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Grace Aber stands in the shade of a mango tree with her children in the remote village of Tumangu in northern Uganda. Four of Aber's nine children have been diagnosed with nodding syndrome, starting with Partick (front), who first showed symptoms in 2002. Matthew Kielty for NPR hide caption

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President Obama speaks in the Rose Garden of the White House on Friday. He said the economy is seeing progress but added that too many people are still struggling. Win McNamee/Getty Images hide caption

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