"How can chimps and humans be 96% genetically identical, and yet differ in so many ways? One answer is a stretch of DNA called Alu, that can move around the genome. Alu elements, which are found in primates but no other mammals, can alter existing genes and can affect the speed of protein production. Because they tend to jump into genes that regulate thousands of other genes, they could have an enormous impact on the characteristics of an organism." Read more...