airman in a real tuskegee airplane. just magical. >>eo gray: the greatest thrill seat where you are and watching the ground drop out from underneath me. the pt-13 was the baby that we used to learn how to fly. >> pelley: the smithsonian collected the thoughts of lieutenant cololel leo gray in 10. >> gray: they said we couldn't fly. but we had the best record of any fighter group in the 15th air force, and probably in the air force itself. brought them home as best we could. and we proved that we could fly. >> pelley: t te is the enemy of history, so smithsonian& conservationists have been working for years restoring america's heritage from textiles to trains. this 1920 railcar had two sections-- "white" and "colored." the same number of seats, but "colored" was compressed in half jim crow confinement just like the guard tower from the prison in angola, louisiana, notorious for cruelty. >> carlos bustamante: it's about 21 feet tall. and this is cast concrete, so it's an enormous object. >> pelley: from monumental to mini

government's syphilis experiment on black men in tuskegee, alabama in 1932. for 40 years, the men were neither told they were in a study nor treated for their syphilis. an outcry in 1972 led to new rules. researchers are now required to disclose risks to test subjects and get their voluntary informed consent. and studies like "support" must be appppved by ethics expertrt where thresearch is conducted. these were prestigious institutions and the federal government. how does something like this slip past evevybody? concern of ours. we looked at the consent forms from 22 institutions and they all failed in their duty to protect human subjects in this study. dr. lantos: most of the criticism is not coming from parents, but from regulators who, in my opinion, don't really understand the circumstances of oxygen therapy. sharyl: when the "support" parents learned about the true risks, the surviving study children were six years old. what thoughts did you have? sharrissa: it was really emotional. a lot of crying, a lot of disbelief, a lot of heartache, and then it wa

. >> reporter: born and raised in tuskegee, alabama, he sent the commodores to the top of the charts. he went solo in 1982 and became a superstar. say you say me >> reporter: dominating popular music with 13 consecutive top ten hits and including five number one's. what a feeling dancing on the ceiling all night long all night >> reporter: he had no formal music training. he says he just somehow knew how to write songs by ear. >> so, i don't know why i know how to play that, it's just that i can play that! to you is harder than trying to -- than just playing, because there is no real -- >> reporter: you can't stop just there! come on now! >> but you got to know. sailing on down the line about a half or mile or so and i don't really want to know where you're going maybe once or twice you see time after time you try but now we're going and i don't mind about the things you're going to say, lord >> reporter: of his many hits, this may be his most famous hello is it me you're looking for >> reporter: of course, when adele released her new single, the similarity was hard not to hear. hello

. >> reporter: born and raised in tuskegee, alabama, ritchie led the come adores to the top of the charts in the 19 0s. she's a brick house >> reporter: he went solo in say you say me >> reporter: dominating popular music with 13 consecutive top ten hits, including five number ones. oh what a feeling when we're dancing on the ceiling all night long >> reporter: ritchie had no formal music training. he says he just somehow knew how to write songs by ear. >> so, i don't know why i know how to play that. it's just that i can play that. >> and so, trying to explain it to you is harder than trying to -- than just playing, because there's no real -- >> reporter: you can't stop just there. >> but you got to know that -- sail on down the line about a half mile or so and don't really want to know where you're going where you're going maybe once or twice time after time we tried but now we're going and i don't mind about the things you're going >> reporter: o his many hits, this may be ritchie's most famous line. hello is it me you're looking for >> reporter: of course, when adele released her new