Every smartphone you tap, e very glass window you look through , and every road you drive or walk on has one common, silent but irreplaceable ingredient: sand. The world uses more than 50 billion tonnes of sand a year , the equivalent of building a wall 27 meters high and wide, surrounding the entire planet! Far from being an infinite source, high-purity silica sand is not a trivial and plentiful resource. Illustration by The Geostrata Rather, it's purified into silicon, wh