so ron, certainly his two lieutenants were peter leon and brian woodford, and we had a couple of spectacular tool designers in houston. michael- and robert -- and th folks that would talk with us on console, our engineering interface for space walks, but all of those people i named after ron sheffield they would all say, no, no, sheffield deserves the credit. >> does someone know the exact number or close to the number of people that were involved completely on the hubble project and how much the entire thing cost? what are the estimates for this effort? >> the cost estimates was in the $3 billion to $4 billion range. >> to build or the whole project? >> to build, launch and what was each servicing mission over the ensuing years, 2009, i don't know those numbers. very safe estimate for the number of people is thousands. >> but you would argue the american public got their money's worth? >> i absolutely -- i think mankind got their money's worth and the american public more than got their money's worth. the inspiration, everywhere you go in schools, hubble images are everywhere. we all have the stars over our head and the moon