They were typically made from volcanic rocks found along rivers. ... Even if I had managed to make one, I doubt my wife Grace would have looked kindly on giving little girls sharp rocks.

NASA's Curiosity rover has encountered patches of sharp “gator-back” rocks causing mission planners to look for a new route ...

The Curiosity rover just avoided a near run-in with some razor-sharp rocks on Mars. The robotic explorer, which landed on the red planet nearly 10 years ago, has spent the last month climbing the ...

Stones with a sharp edge, but also well suited to be held in the hand – which the team calls “naturaliths” – are abundant where suitable rocks are present, the team argues.

Sharp stone technology chipped over three million years allowed early humans to exploit animal and plant food resources. But how did the production of stone tools -- called 'knapping' -- start?

Stones with a sharp edge, but also well suited to be held in the hand – which the team calls “naturaliths” – are abundant where suitable rocks are present, the team argues.