These crystals are produced in molten rock as it travels from deep inside Earth to the surface. With increasingly sophisticated scientific methods, we can extract a secret history of volcanoes ...

For years, an elaborately displayed tooth at the Art Institute of Chicago has been thought to belong to the major Christian religious figure John the Baptist. As it turns out, that claim has no teeth.

That’s par for the course on the red planet, but there was something very different about this rock. It had a surprise inside: pure sulfur crystals, something never before seen on Mars.

About 400 kilometres northwest of Sydney, just south of Dubbo, lies a large and interesting body of rock formed around 215 ...