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>> people are worried about a double dip, maybe from europe. >> yes, 9.9% of gdp. >> do you know how much has been lost in greece? >> greece's debt to gdp, budget deficit is 13.6% which is just unsustainable. ours? it's 9.9%. that's a little too close. that's what others like. ben bernanke and others are watching. >> it has been over 10, hasn't it? >> yes, it has. >> thanks, christine. >> thanks. detroit, the controversial plan to tear down parts of the city, that would mean one or two homes standing in these areas. some of the people inside say i'm not moving. we're going to talk about why ...

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Well, with slightly more research than that, cosmologist stephen hawking is issuing a similar warning that we may not be alone. there may be other hostile life out there. they may be hungry and we should be careful going out to look for them. nasa includes sending a lander to mercury and exploring both jupiter and saturn. joining us is washington's planetary scientist james green. james, great to see you. >> good morning, john. >> what do you think about steven hawking's warning? should we be worried about probing the atmosphere about what we should find out there? >> well, steven is, indeed, ...

Are you looking for bacteria, single-cell amoebas? what are you looking for? >> we're looking for all of those. there could be fossil records, it's a little more complex than just microbial. so there is a variation there, and what we have to do is develop the experiments and instruments to be able to make the measurements that enable us to really understand how life could exist in other worlds. >> national academy of science, in its decadal redue of search for life has proposed about 28 missions to go out and look for life. nasa has got about 12 planned. i want to go over with you, jim, some o...