Some of the world's most notorious murders are the subject of "It Takes a Killer," which investigates the crimes from the perspective of the killers, trying to get inside their minds and determine their motives. Leading homicide investigators and experts from such agencies as the FBI and Scotland Yard take a look at the evidence pulled from crime scenes and profile the killer's behavior to try to piece together the details of each murder, explaining when, why and how each criminal committed the crime. For the wannabe detectives watching the show, the experts also reveal how the crime was solved -- which often requires authorities to think like a killer.
You may not want to watch "Paranormal Witness" alone if you're easily spooked. This series brings to life -- through the use of first-hand testimony, home videos and personal photos -- the stories of people who have lived through paranormal experiences. In addition to featuring the usual paranormal stuff -- UFO sightings, poltergeists, haunted mansions, to name just a few -- "Paranormal Witness" episodes also tell the stories of a child with an imaginary friend and a highway that is said to be haunted.
National Geographic expeditions expert Casey Anderson leads viewers on a trek from the bottom of the Grand Canyon to the Arctic Ocean, and to many places in between, on a search for rare and endangered species such as wolverines, mountain lions, black bears and polar bears. In the episode "Wolverine King," for example, Anderson manages to forge a unique face-to-face bond with Jasper, a captivity-raised wolverine, to separate fact from fiction and learn the truth about these notorious carnivores. And in "Grand Canyon Safari," Anderson observes condors, rare Kaibab squirrels, tree frogs, rattlesnakes and chuckwalla lizards in their natural habitats.