James Turrell is building an observatory that uses the human eye instead of optical instruments. It may soon be open to the public for the first time.

It’s not easy to measure a mountain. Mount Everest's height has been known since the middle of the nineteenth century, but how did they figure it out with no altimeters or GPS?

What would happen if the Earth's magnetic poles flipped? Earth’s magnetic poles have a long history of switching from North to South and back again. 

Developing rare earth mining in Afghanistan has been a potential objective since the USGS estimated the country had $1 trillion in mineral ore deposits.

The Cave of Crystals is a massive cavern, filled with gigantic gypsum crystals, larger than any crystals ever before seen on Earth.

One of the world’s most incredible, yet unsung, ecosystems, karsts are home to a remarkable biological diversity.

Diamonds are sparkly. Diamonds are expensive. But diamonds are more than bling—they tell us a lot about the earth, itself.

New findings indicate life on earth is older than we thought.