Why does thunder rumble? Acoustic professor Trevor Cox explains that it has to do with the way lightning is a jagged line. "Each little kink is actually generating the sound, and the reason thunder rumbles is because the sound takes different time to come from different kinks because they're all slightly different distances from you," he says. Mariana Suarez/AFP/Getty Images hide caption

In 1975, Shoah director Claude Lanzmann (left) interviewed Benjmain Murmelstein, the last surviving Elder of the Jews of the Czech Theresienstadt ghetto, at his home in Rome. The resulting film is The Last of the Unjust. Cohen Media Group hide caption