Archaeologists are now mapping a wall in eastern China that is as much as 15 feet tall in some places, and predates the more famous barrier by 300 years. Hundreds of miles long, it was likely erected to keep neighboring Chinese dynasties from invading each other, historians say.
Children in low-income families hear dramatically fewer words, which often sets them back in school and later life. The gap was officially documented in the 1990s, but has persisted. Now an entire city is trying to close the divide.