The world is running out of sand. About 50 billion tons of sand and gravel are extracted annually, most of which is used for ...

“Sand and gravel represent the highest volume of raw material used on earth after water. Their use greatly exceeds their natural renewal rates” (UNEP, 2014). Each grain of sand originates from rock on ...

Every year, the world consumes around 50 billion tonnes of sand, gravel and crushed stone. The astonishing scale of this demand is hard to comprehend—12.5 million Olympic sized swimming pools per year ...

[Nick] is working on a prototype of a coffee table sand plotter that draws patterns in sand a lot like a zen rock garden. [Nick]’s zen rock garden uses a magnet to draw a ball bearing across ...