Nurse Carina Araujo gives care to a child in the neonatal intensive care unit at Maternidade Doutor Alfredo da Costa Hospital in Lisbon, Portugal, on June 6. Portugal's birthrate has dropped 14 percent since the economic crisis hit. The Washington Post/The Washington Post/Getty Images hide caption

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A shark warning is displayed near Gracetown, Western Australia, in November. An Australian man was killed by a shark near the area that month, sparking a catch-and-kill order. Rebecca Le May/EPA/Landov hide caption

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You can do it. But your 16-year-old can't. Teens were more likely to have accidents while eating or talking in the car. iStockphoto hide caption

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Almaz Acha sits with her baby Alentse at her home in the rural community of Sadoye, in southern Ethiopia. Families in rural communities, like this one, have benefited from Ethiopia's health extension program. Julien Behal/PA Photos /Landov hide caption

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Social media is booming in Brazil, which has become a major market for both Facebook and Twitter. But Brazilian law is still in flux, and legislation is only just being created to deal with the rise of social media. Christophe Simon /AFP/Getty Images hide caption

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New York City Mayor Bill de Blasio (from left) arrives with his family Chiara de Blasio, Chirlane McCray and Dante de Blasio to take the oath of office on the steps of City Hall on Wednesday. Frank Franklin II/AP hide caption

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Butterfly breeder Carl Anderson with monarch butterflies on his face, 1954 John Dominis/Time & Life Pictures/Getty Image hide caption

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