i ask sandra bern hart how comedy has changed. >> there's nothing like it, live performance. you never forget. you forget a movie that you saw. you can't name the movie, but you remember what play you saw. >> al jazeera america presents >> somebody's telling lies... >> it looks nothing like him... >> pan am flight 103 explodes december 21st, 1988 was the right man convicted? >> so many people, at such a high level, had the stake in al-megrahi's guilt >> the most definitive look at this shocking crime >> the major difficulty for the prosecution that there was no evidence >> al jazeera america presents lockerbie part two: case closed >> these people have decided that today they will be arrested >> i know that i'm being surveilled >> people are not getting the care that they need >> this is a crime against humanity >> hands up! >> don't shoot! >> hands up! >> don't shoot! >> what do we want? justice! >> when do we want it? >> now! >> they are running towards base... >>...explosions going off we're not quite sure... >> fault lines al jazeera america's emmy winning, investigative,