James Comey - In 2014, then-FBI director James Comey spoke to Scott Pelley about his job and the political independence it required in order to effectively uphold the rule of law.The Bin Laden Documents - Bin Laden documents reveal a loving, vengeful son who might take his father's role atop an al Qaeda that's stronger than ever, says ex-FBI agent. Personal letters seized in the raid that killed Osama bin Laden reveal the al Qaeda leader's son to be a young man who adores his father and wants to carry on his murderous ideology. That son today is poised to lead a stronger, larger al Qaeda and is bent on avenging his dad's death, says an ex-FBI agent familiar with those documents. Holly Williams interviews Ali Soufan, the former FBI agent who was the bureau's lead investigator of al Qaeda after the 9/11 attacks. Soufan describes a letter from the son, Hamza, that was collected in the raid and now declassified. "He tells him that…he remembers 'every look…every smile you gave me, every word you told me.'" Hamza would be about 28 now and wrote the letter when he was 22 and had not seen his father in several years. Hamza also wrote this: "I consider myself to be forged in steel. The path of jihad for the sake of God is what we live."Curiosity - Rover "Curiosity" explores whether life could have begun on Mars. Is Earth the only planet in our solar system that has life on it? Scientists can't say for sure, but it's possible life could have flourished on Mars based on data gleaned by the Mars rover "Curiosity." Bill Whitaker reports on the sights and data beamed back more than 30-million miles from Mars by Curiosity, information that's telling scientists a lot about the Red Planet and Earth. Whitaker visits the Jet Propulsion Laboratory in Pasadena, California, to bring viewers on a trip to Mars. JPL monitors show incredible images from its surface, such as a sunset and Martian terrain. But information from Curiosity's internal lab offers evidence of essential organic chemicals, leading JPL's Chief Engineer Rob Manning to consider an even wilder trip. "Could have been that Mars was habitable before Earth was and life got its foothold on Mars and took its journey to Earth and we're all Martians." Manning explains. "When a meteor comes along and hits Mars, a rock from Mars can be lifted up, travel in circles around the sun until someday it will bump into Earth," he tells Whitaker. "We've found Mars rock…we've found them all over the Earth." Manning says Earth rocks have traveled to Mars in the same way and that it's possible life could have survived the journey.