>> garvie: exactly.to agree with the computer, we are going to go to find evidence that agrees with it >> cooper: but garvie says the computer is only as good as the software it runs on. algorithms, there are some terrible algorithms, and everything in between. >> cooper: patrick grother has examined most of them. he is a computer scientist at a little-known government agency called the national institute of standards and technology. >> different races, different sex... >> cooper: every year, more than a hundred facial recognition developers around the world send his lab prototypes to test for accuracy. are computers good at recognizing faces? >> grother: they're very good. i-- they're-- they're better than humans today. >> cooper: are these algorithms flawless? >> grother: by no means. >> cooper: software developers train facial recognition algorithms by showing them huge numbers of human faces so they can learn how to spot similarities and differences, but they don't work the way you might expect. we'v