i'll tell him this, the world is rooting for them. >> make him say it. thank you so much. thank you for joining us. people have been calling this the great american city. boston strong. that strek is matched only by the concern and compassion for those injured an ento the memories those killed. coming up, a look at a living memorial right here in boston. this week on "the next list," innovator of the bionic arm. >> the mission is to blur the boundaries of humans and machines. what we do here is build robot that is attach to the body, to the legs that augment a person's physicality to move again when they're not able to move. >> why do you call it a robot attached to the body? >> we are developing very advanced systems. i would call them bionics. stealing from the hollywood