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An ambitious dare. this weekend, cnn will show you the next moonshots that could catch the world's attention. maybe it will be a star created here on earth. u.s. researchers are part of a 35-nation team working to make that happen. what if humans could live on mars? fareed zakaria is coast of "fareed zakaria gps," he'll show you the space camp set up here on earth to simulate the red planet. >> bye! >> reporter: five people spent four months in a small dome on the mars-like monoloa volcano in hawaii. there was a 20-minute communication delay with the outside world, similar to what mars astrona...

Being used against the president i think is sort of hilariously disgusting if that's such a thing. but the bigger question is, i mean, to what degree does donald trump have a seat at the table in the republican party? he's joked about speaking at the republican national convention and wanting a primetime slot. chris matthews asked him -- sorry, he asked newt gingrich about it. this is something trump has been lobbying for for om time. >> he was pleading. he was demanding. but i think he may. romney already kind of owns him. they have a great handshake where romney is looking away from the came...