and oranges but to follow on charlie, took curiosity on mars 3 1/2 years to cover the same that gene and jackid on apollo 17 in three days and brought back 245 pounds of rocks and material. so again it puts -- you need both but it costs more, too. >> next question? >> a short question, but likely a bit controversial. you talk about competition and collaboration and it seems to me one of the big elephants in space might be china. i'm interested in your response in addressing the relationship in terms of space and china. >> why does everybody look at me? i'm the guy that shot him, again. >> most recently -- >> say what you will about president obama and the obama administration, in 2010, we thought we were on the verge of having another apollo soyuz but a shinjo shuttle or whatever you call it and it got shut down by the congress, so you know, all of you recognize, because a lot of your intellectual and academic partners are chinese. everybody, we got problems with everybody. you know, what makes us able to work on the international space station so incredibly well, it's mission focused. it's d