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 ...
WEBVTT ANOTHER COLD FRONT COMES IN. JENNIFER: MIRI, I THINK YOU ARE GOING TO WANT TO COME PLAY WITH THIS. I'M HERE WITH CLAIRE. SHE'S GOING TO SHOW US HOW TO MAKE HYDROPHONIC SAND. SAND THAT DOESN'T ...
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