Earth Sciences

Tracking Arctic freshwater flow from space

Arctic rivers wind through remote tundra and boreal forests, freezing solid in winter and surging each spring with snowmelt, eventually emptying into the ocean. Runoff—water that does not soak into the ground but instead flows […]

Economy

Online ad fraud is a feature, not a bug

Technological advancements and the dynamics of the platform economy make rooting out fraud more complicated than it may seem. With print media circulation and broadcast television viewership in free fall, a lot is riding on […]