a tool back in the stone age. and now in orlando colin breslin morse found some fossils while working trapped between the different layers of rock thanks for those responses. a revolutionary gene editing method has been making waves in a science world in the last few years crisper cas nine can also d.n.a. very precisely by acting as genetic scissors. it works like this the scissors are a protein. it is assigned a kind of search word for example a g c in this simplified model our d.n.a. is made up of lots of different combinations of codes like these. the series of proteins scans the d.n.a. . and when it's found the search word the scissors are activated and they cut the