“Ever twisting, turning, and at war with itself and external invaders, DNA provides the fuel for evolution’s changes. Ten percent of our genome is made up of ancient viruses, and at least another 60 percent consists of repeated elements made by jumping genes gone wild. Only 2 percent is made up of our own genes. With cells and genetic material of different species merging and genes continually duplicating and repurposing, life’s history flows more like a braided and meandering river than a straight channel.”