ONCE upon a time, smartphones were small—not by choice, but by design. I remember when a 4-inch display felt groundbreaking, a portal into the future. Then came the first Note with a “massive” ...

OKAPI WILDLIFE RESERVE, Congo—Scattered along the banks of the Ituri River, buildings cram together, cranes transport dirt and debris scatters the soil. The patches of trees are a scant reminder that ...