For humans, the DNA sequence runs about three billion letters long, with your sequence differing from that of Albert Einstein or Marie Curie or William Shakespeare or anyone else by less than about a quarter of a percent, roughly one letter out of every string of five hundred.23 But while basking in the glow of possessing a genome so similar to that of any of history’s most revered luminaries (or infamous villains), note that your DNA sequence also has a 99 percent overlap with any given chimpanzee’s.24 Minor genetic differences can have major impact.
