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Harvard, who happens to be an explosives expert. he's done two tours of duty in afghanistan. >> i've been about 16 years in the infantry in the army so i know a little bit about what happens when things blow up. >> reporter: back home, began to study how an explosion rattles the brain and can damage it permanently. >> what happens when the brain gets hit by a blast wave and it slams up against the inside of the skull? >> reporter: with colleagues at northeastern university, he's found ingenious ways to simulate the mechanics of the injury. >> you can imagine that when you drop a rock in a pudd...

solved and the battles are not all won and we stand today on the edge of a new frontier. >> president john f. kennedy, jfk, and then there was bobby. >> we have to make an effort to understand and get beyond or go beyond these rather difficult times. >> and teddy, the third to reach the u.s. senate. >> too many of our senior citizens are being forced to choose between neglecting their ing aments are or being authorized by them. >> at home there was ted and his wife joan. teddy, jr., kara, and patrick, who was the youngest by six years. it was july of 1967, patrick's birth made headli...