Everything you wanted to know about bitcoin but were afraid to ask
The value of cryptocurrencies is rising fast. But is it sustainable? And how does it work, anyway? These questions, and many more, answered…
Observer New Review
Is Richard Branson’s high-speed train in a pneumatic tube pie in the sky?
First airlines, then spaceships. Now the Virgin boss wants to build Hyperloop One – a high-speed, pneumatic maglev railway. But engineering experts doubt that it will ever leave the station
The Bilbao effect: how Frank Gehry’s Guggenheim started a global craze
Opened 20 years ago this month, the glittering titanium museum had a wow factor that cities around the globe were soon clamouring to copy
The Jean-Michel Basquiat I knew…
The graffiti artist turned painter became the star of the 1980s New York art scene. Since his death aged 27, his reputation has soared. On the eve of a major UK show, we speak to those who knew him best
The Spanish holiday home as an architectural collectible
In rural Aragon, the Solo Houses project is giving international architects free rein to create the buildings of their imagination
Sun Rain Room review – a home for all seasons
Architects Anna Liu and Mike Tonkin have spent 12 years on an extension that lets the weather straight into their Georgian townhouse. The result is hard not to love – especially on a rainy day