A silent kidney crisis is spreading far faster than experts expected

From satellite imagery to clandestine price reports, a new study draws on North Korea to explore economic activity in opaque regimes and information-scarce regions. North Korea is the blackest of economic black holes. Even a basic question like "is the economy shrinking or expanding?" can be difficult to answer. The country does not publish reliable statistics. It sharply restricts outside access and treats trade data as a state secret.

Ever feel uncomfortable when a payment screen asks for a tip? We sure have. As tipping prompts become more widespread, more consumers are feeling uneasy or frustrated, but not always sure why.

Radar data from an agricultural area in South Africa, shown in a vivid color palette, reveal crop types and how they changed during the Southern Hemisphere's growing season.

Professional learning and student assessment in schools is set to be transformed, thanks to a first of its kind advance in education technology led by the University of Glasgow.