suzanne shaw has the story. >> behind the daunting walls of san quentin state prison, inside this oldne shop, convicted felons are reaching for the stars. >> the whole nasa thing is just, wow. you don't even get that at the best technical school in the country. to get that in prison. >> studying math and science and under the strict supervision of nas a they are building cubes that may some day carry miniature satellites into space. >> do you actually program this? >> yes, we do. we actually sit here and tircnk around with the codes. >> they are proud of what they have learned. pa. >> you couldn't use any tools? >> i didn't know the names of them or how to use them. >> richard runs the metal shop. >> i'm really finicky about the work they do. >> a veteran of many aerospace jobs, the peace keeper missile and the space shuttle, this job is the most rewarding. >> to not only watch the guys use their skills, their machine skills and their life skills as well. >> here the inmates help each other, a stark contrast to the outside yard where turf is divided by race. black, white, mexican, asi