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Seth Wenig/AP

By the time girls reach age 17, more than one-third of them have experienced depression, according to a new study in the journal Translational Psychiatry. The data was compiled from 100,000 children who participated in the annual National Survey of Drug Use and Health between 2009 and 2014.

It's different with boys. By age 17, only 13.6% of boys experienced depression. Senior researcher Joshua Breslau told The Washington Post that the large gap between boys and girls is partially attributable to something socially or biologically that girls experience during their teen years. However, he noted that the difference is significant as early as age 12, suggesting that the origin of depression begins at an even younger age.

The conclusion: Researchers determined that children who experienced depression function similarly in school, and also showed a similar likelihood of suicide. There is still more to be done to understand why some develop problems later in life and others come out of depression without intervention, study author Elizabeth Miller told the Post. She says it is essential for people who work with children to be able to identity signs of depression.

Go deeper

Updated 49 mins ago - World

Islamic State claims responsibility for deadly bombing in southern Afghanistan

The mosque after the explosion in southern Kandahar province on Oct. 15. Photo: Murteza Khaliqi/Anadolu Agency via Getty Images

The Islamic State group claimed responsibility for a massive blast that tore through a crowded Shiite mosque in the southern Afghan city of Kandahar on Friday, killing at least 47 people and injuring dozens more, AP reports.

Why it matters: Friday's attack was the deadliest to strike Afghanistan since the U.S. withdrew its troops from the region and is the second major attack on a Shiite mosque in a week, underscoring the Taliban's growing security threat from other militant groups.

New wave of strikes will test worker power

Illustration: Sarah Grillo/Axios

Thousands of John Deere workers hit the picket line this week after the union smacked down a new worker contract from the farm and equipment maker.

Why it matters: There’s a wave of worker angst spreading across the country. They wield new power that’s come with a historic worker shortage.

Bryan Walsh, author of Future
4 hours ago - Technology

The smart city comes of age

Illustration: Aïda Amer/Axios

Better sensors, more intelligent AI, and the coming wave of 5G wireless could finally fulfill the promise of the smart city.

Why it matters: How we organize, run and power our cities will be increasingly important in the years ahead, as urbanization expands and the damaging effects of climate change compound.

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