Urton knew that these findings were a tiny part of cracking the code and that he needed the help of people with different skills. So, early last year, he and a graduate student, Carrie Brezine, unveiled a computerized khipu database – a vast electronic repository that describes every knot on some 300 khipu in intricate detail. Then Urton and Brezine brought in outside researchers who knew little about anthropology but a lot about mathematics. Led by Belgian cryptographer Jean-Jacques Quisquater, they are now trying to shake meaning from the knots with a variety of pattern-finding algorithms, one based on a tool used to analyze long strings of DNA, the other similar to Google's PageRank algorithm. They've already identified thousands of repeated knot sequences that suggest words or phrases. Now the team is closing in on what might be a writing system so unusual that it remained hidden for centuries in plain sight. If successful, the effort will rank with the deciphering of Egyptian hieroglyphics and will let Urton's team rewrite history. But how do you decipher something when it looks completely unlike any known written language – when you're not even sure it has meaning at all?