A copper refinery transformed its waste stream into an unlikely renewable energy goldmine, turning forgotten byproducts into the very panels that now power its operations.

Opportunity self-portraits from January 2014, left, and March 2014 show how wind removed much of the dust from the rover’s solar panels. These images postdate the first dust-devil photograph and do ...

Concrete is the second most-used substance on Earth after water, and the cement that holds it together is one of the biggest headaches in climate policy. Making cement means heating limestone until it ...

A solar telescope in New Mexico is being torn down, and the reason is a pool of liquid mercury hidden inside it. The mercury was the clever trick that made the telescope work. It is now the thing that ...

Kiruna’s church went for a walk in August 2025, at half a kilometre an hour, on 224 wheels. The trip took two days and included a daily stop for fika, the Swedish afternoon coffee break, because some ...