The Artic Frontier - Lesley Stahl goes to the top of the world where the next battle over oil and mineral resources is shaping up as the region becomes more accessible due to climate change.Don't Mess with Mary Quin - After narrowly surviving being held hostage, former-Xerox exec Mary Quin tells 60 Minutes how she brought a radical British cleric to justice for his role in the kidnapping.Nate Parker - Hollywood filmmaker Nate Parker will not apologize for the rape case he became embroiled in at college 17 years ago because, he tells Anderson Cooper, he was falsely accused and then vindicated in court. He also says it would be unfortunate if people stayed away from his new historical epic based on Nat Turner's slave rebellion because of the incident. Parker's film, "The Birth of a Nation," had generated a huge amount of Oscar buzz until an uproar grew over the incident and it became widely known the woman who accused him killed herself in 2012.