It's not the end of the world if you forgot to put enough postage on your ballot. That voter question and others, answered. Next, a Denver rabbi explains the Mourner's Kaddish. Then, a Columbine survivor made a documentary that follows her former classmates as they return to the school. Also, the Smithsonian is preserving black history in Five Points. Finally, Pulitzer Prize winner Jose Antonio Vargas at the Aspen Ideas Festival.