As most readers would know, the vast majority of our DNA “text” is not used in the coding of proteins and enzymes—it is non-coding—and scientists generally don’t have any idea what its purpose is. Thus, in their infinite wisdom, they initially dubbed it “junk DNA”. How much of our DNA is junk? About 95–98 per cent—rather a lot of waste for Nature to hang onto, I think you will agree (some scientific estimates go as high as 99 per cent). Since it is not responsible for constructing our basic physical form, its purpose has remained mysterious to conventional mindsets until very recently. We now know that a large portion of that “junk” DNA is made up of mobile genetic elements (transposons and retrotransposons) or “jumping DNA”, which can rewrite and activate—or deactivate—certain genetic codes.