c.b. vance "wow!" get to know them, as they discover who they really are. k. alexander "that's pretty amazing." finding your roots with henry louis gates, jr. starts tuesday, september 23rd - only on pbs. the women were breaking the glass ceiling and that just thrilled me. we're traveling back in time... wow. ...to help solve family mysteries. no way that's amazing. fdr: a new deal for the american people. we wouldn't be who we are without them. ♪ ♪ i just got to get get get on back to my home at any cost now now ♪ [laughing] connected every day in a thousand unseen ways. but sometimes these connections can pose an invisible threat... if the object we touch or the air we share carries a dangerous germ. simon fensterszaub: you don't have to cough, you just have to breathe. it's the worst kind of contagion; it's airborne. narrator: diseases largely unseen for a generation are returning. fensterszaub: i'm, like, "this can't be. how does a kid have measles?" this is new york! we don't see measles in new york. jane zucker: it's astounding to me that you can have pe