Uzuri Pease-Greene, right, leads a walk through the public housing complex in the Potrero Hill neighborhood of San Francisco where her family lives. She is working to have the old buildings replaced.
Talia Herman for NPR
Mamuedeh Kanneh was married to Laiye Barwor, the man who brought Ebola to Barkedu, Liberia. He died of the virus. She now cares for her children as well as children who lost their parents to the disease.
John W. Poole/NPR
The size of the brain of a chimpanzee (right) is considerably smaller than that of a human brain. Probably multiple stretches of DNA help determine that, geneticists say.
Science Photo Library/Corbis
People who practice free-range parenting say it makes kids more independent, but others see it as neglect. State and local laws don't specify what children are allowed to do on their own.