National Geographic and Katie Couric chronicle the gender revolution with moving human stories in this two-hour documentary timed to coincide with National Geographic Magazine’s January single-topic issue exploring gender issues around the globe. Gender Revolution will explore the complexities of gender in everyday life, from the moment we are born through our twilight years.  With conversations that range from the scientifically enlightening to the deeply personal, Couric’s unflinching search for truth sheds light on countless untold stories of struggle, understanding, ignorance, hurt and love. 9pm ET, National Geographic, check local listings for channel