New apartment buildings are replacing empty lots in Mantua, one of Philadelphia's poorest neighborhoods. Will Figg for NPR hide caption

itoggle caption Will Figg for NPR

Emily Neblett, a patient at the Monroe Carell Jr. Children's Hospital in Nashville, Tenn., demonstrates circuit pieces from the mobile maker space that are connected by magnets. Noah Nelson/Youth Radio hide caption

itoggle caption Noah Nelson/Youth Radio

The California Aqueduct carries water from the Sierra Nevada Mountains to Southern California. It is one of four aqueducts in the region that glide across the San Andreas Fault. David McNew/Getty Images hide caption

itoggle caption David McNew/Getty Images

Free Syrian Army fighters run behind sandbags in Daraa Al-Mahata, in southern Syria, on Jan. 21. Many moderate rebels joined the uprising to fight against President Bashar Assad, but the U.S. plans to train them to fight the self-proclaimed Islamic State. Wsam Almokdad/Reuters/Landov hide caption

itoggle caption Wsam Almokdad/Reuters/Landov

Allison Begalman, a student at the University of Southern California, wears goggles and headphones to experience a virtual mortar strike on civilians in Aleppo, Syria. James Delahoussaye/NPR hide caption

itoggle caption James Delahoussaye/NPR

When he was 59 years old, Greg O'Brien was diagnosed with early-onset Alzheimer's disease. Five years later, he is speaking publicly about his experience, even as his symptoms worsen. Courtesy of Greg O'Brien hide caption

itoggle caption Courtesy of Greg O'Brien

A Philadelphia police officer demonstrates a body-worn camera being used as part of a pilot project last December. Matt Rourke/AP hide caption

itoggle caption Matt Rourke/AP

President Obama called on the Federal Communications Commission to implement a strict policy of net neutrality and to oppose content providers in restricting bandwidth to customers. Michael Bocchieri/Getty Images hide caption

itoggle caption Michael Bocchieri/Getty Images

Dr. Stephen Teach helps Jeffery Ulmer listen to his daughter Alauna's asthmatic breathing at Children's National Medical Center in Washington, D.C. Alauna's mother, Farisa, holds her. The District has one of the highest rates of pediatric asthma in the country. Jahi Chikwendiu/Washington Post hide caption

itoggle caption Jahi Chikwendiu/Washington Post

The Juvenile Justice Delinquency and Prevention Act allocates grant money to states, which are supposed to protect young offenders and make sure they're not housed with adult criminals. Whistleblowers say they've spent years flagging problems with the programs. David Goldman/AP hide caption

itoggle caption David Goldman/AP

Suzan Shown Harjo points to a signature on Treaty K at the National Archives. The document will be on display in 2016 at the Smithsonian's National Museum of the American Indian for an exhibit on treaties curated by Harjo. James Clark/NPR hide caption

itoggle caption James Clark/NPR

Robert Duvall (right) was nominated for Best Supporting Actor for his role in The Judge, which also starred Robert Downey Jr. The nomination left many critics scratching their heads. Claire Folger/AP hide caption

itoggle caption Claire Folger/AP

Bruno Mbango Enyaka gets his flu shot at a community health center in Portland, Maine, on Jan. 7. Gabe Souza/Press Herald via Getty Images hide caption

itoggle caption Gabe Souza/Press Herald via Getty Images

A pedestrian passes a currency exchange in London Jan. 5. The value of the U.S. dollar has risen about 15 percent against the euro since last summer. Andy Rain/EPA/Landov hide caption

itoggle caption Andy Rain/EPA/Landov

President Obama speaks Tuesday at the National Cybersecurity and Communications Integration Center in Arlington, Va. Pool/Getty Images hide caption

itoggle caption Pool/Getty Images

Ephraim Benton, a former resident of Tompkins Houses in the Bedford-Stuyvesant section of Brooklyn, is now an actor. Benton started a community-based organization called Beyond Influencing Da Hood, which puts on health fairs, film festivals and various free community events in his old housing project. This photo was taken in front of his old building in Tompkins Houses. Courtesy of Shino Yanagawa hide caption

itoggle caption Courtesy of Shino Yanagawa

Royal Robbins climbs El Capitan's North American Wall in Yosemite National Park in 1964. Robbins is a climbing purist whose ideas helped shape the sport. Glen Denny hide caption

itoggle caption Glen Denny

Syrian political cartoonist Ali Farzat sits at his desk at a Kuwaiti newspaper on Dec. 14, 2011. Earlier that year, Farzat was badly beaten in retaliation for cartoons that mocked Syrian President Bashar Assad. Yasser al-Zayyat/AFP/Getty Images hide caption

itoggle caption Yasser al-Zayyat/AFP/Getty Images

New York City Police Commissioner Bill Bratton speaks during an NYPD swearing-in ceremony in New York on Jan. 7. He confirmed to NPR today that there had been a work slowdown by officers in the weeks since two police officers were shot dead. He said the matter was being corrected. Seth Wenig/AP hide caption

itoggle caption Seth Wenig/AP

There's been a sharp decline in the number of arrests and tickets and summonses issued in New York City. Police sometimes use work slowdowns to show dissatisfaction with policies, workloads or contract disputes. Justin Lane/EPA/Landov hide caption

itoggle caption Justin Lane/EPA/Landov

Irene Chen and Longlai Zuo, with the China-based company Quality Technology Industrial, show off their top-line phones, which cost about $100. Aarti Shahani/NPR hide caption

itoggle caption Aarti Shahani/NPR

As an Army chaplain in Iraq, David Peters administered last rites and grieved with survivors. When he came home, he says, he "fell apart emotionally and spiritually." Courtesy of Robert K. Chambers hide caption

itoggle caption Courtesy of Robert K. Chambers

When Jasmine Uqdah aged out of the foster care system in 2008, she didn't have a job, a checking account or a car. She did have a college acceptance letter — but no money to pay for schooling. Joshua Lott for NPR hide caption

itoggle caption Joshua Lott for NPR