DNA is naturally made up of combinations of four nucleobases: adenine, guanine, cytosine and thymine. Represented by the letters A, G, C and T, these bases group together in different sequences to form blueprints for every living organism. And this information storage system is incredibly dense, with a single gram of DNA capable of storing up to 215 petabytes (215 million GB) of data.That of course makes it a very attractive potential storage solution for the huge amounts of data modern society produces daily – the entire contents of the internet could fit in a shoebox full of DNA. And as if that storage wasn't dense enough, the researchers on the new study have found a way to double it.