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thing to see these robots begin along the very long path to get to where they're actually going to be useful to help us in our lives. >> reporter: chad myers, cnn, atlanta. >> thank you, chad. neat stuff. now to an update about one of our cnn heroes, doc henley. his work is now the subject of a new documentary which premieres tomorrow night at 8:00 p.m. eastern on cnn. here's a preview -- >> gonzalo and i are heading up the river to a little village which actually translates directly into the miraculous or the miracle. we've got the amazon river and all these tributaries that are leading into the amazon river. there's water all over the place, but that water's just absolutely filthy. they're bathing, they're washing their dishes. a lot of times using the restroom all right there in the same water source and that's the thing that's causing them to get sick.