dr. steve palum bi from stanford university in california. >> it's a remarkable way to look at the ocean. we don't necessarily think about the very small things very much. but in the ocean the mall things are a big deal. they produce a huge fraction of the oxygen that we breathe on the flaunt. by a third of the life on the planet is tied up in these tiny things. they live, breathe reproduce so quickly, and they're a big part of the life on our planet. this expedition was one of the first ones to look at those small stuff and return with a new set of information that we've never seen. this is the base of the food chain that supports all the fish that we eat. those are moving around, too. they're very sensitive to temperature. it stands to reason that as the ocean temperature changes due to climate change that we'll see massive changes in the life of the ocean cascading from that. >> back here on the surface huge advances are being made in a technology that can change the lives of some of the world's most severely injured people. caroline malone reports on these bionic pie pioneers. >> grea