benu is about the size of the empire state building. it could potenwially collide us over the next 200 years. seats a good idea to understand what it's doing upthere, whats orbit is. eventually the team would like to bring back a sample from benu, to do sophisticated laboratory tests here on the ground. but what's interesting is they already found the presence of water benu,t the good water, but inside claiz. so, william, if you'rethinking about extending out human rogennce into space, hyd and oxygen in water, that's rocket fuel. and so that could be a filatling n to the stars for us. and i'll leave it at that. >> braham: miles o'brien, as always, thank you so much. >> woodruff: tonight's brief but spectacur episode features franny choi, a poet whose work examines contemporary social issues. her first poetry collection is called "floating, brilliant, gone" and is availableow. >> there are only so many parallel universes that concern us. in one, he isn't dead, in another, you drink light with your hands all winter. a there niverse in whi