In Cairo’s City of the Dead, where homes are mausoleums and communities have grown among the graves, residents speak out ...

Sponge-like material filled with air pockets can transform saltwater into freshwater using the sun, supporting sustainable ...

Research suggests productivity and health of trees across the world may be at risk as climate change continues to wreak havoc ...

Discover the world’s longest and deadliest heatwaves – from Phoenix to Paris – and how climate change is making extreme heat ...

The starting protocol is equally perverse. Runners are told to gather on a particular date, but the race can start at any ...

From submarines to space stations, and from Guam to the US Virgin Islands – how Americans mark their independence off the ...

Discover exactly how NATO spending works and what exactly nations are spending their budgets on around the world ...

From facial recognition to delivery drones and crop monitoring, discover how nations are deploying new AI tech, and who is ...

How well do you know your flags? From bold stripes to curious colours, flags reveal a lot about a country’s identity. Put ...

The cruise industry is under scrutiny for its environmental toll – but a new wave of sustainable initiatives is charting a ...

Discover more about potash: the mighty group of minerals and chemicals supporting food production across the planet ...

Explore the 10 largest US military bases worldwide by troop size – from South Korea and Germany to Japan and beyond ...