DNA Divergence is in How You Count

It’s a common misconception that chimp DNA differs from Homo sapiens sapiens genes by only a single percent, but this number is apocryphal. In actuality, the degree of similarity of human and chimp genetic code depends mostly on how you count. Since all complex organisms from Earth possess great swaths of junk DNA inherited from a distant common ancestor, there tends to be startling similarity between many organisms. Sure, humans are like chimps—but they’re also like flatworms and fruit...