Dallas Seavey, the youngest ever Iditarod champion, brings a racer's sense for speed and efficiency to the expedition.
(01:08)Young cheetahs wait for newborn wildebeests, stalking them before the wildebeests begin their migration.
(02:56)Source of Life
(01:39)Brent Sass describes the expedition down the Yukon River.
(01:52)Willi Prittie shares his thoughts while on the expedition through the Tordrillo Mountains.
(02:05)Tagging Great Whites is advancing research and providing key information about how to protect this vulnerable predator.
(03:03)Tyrell Seavey describes the exploration of Nunivak Island.
(00:59)"The fear is always there, especially at night when you can't see what's coming at you."
(03:04)Katie talks about how the crew got so close to the whales.
(01:55)A small group of scientists is on a mission: find the last stretches of ocean that remain as they were before man.
(03:03)Mercury is shrinking, its core accounts for 60% of its mass. NASA's Messenger spacecraft investigates.
(03:01)An army of robots construct the car’s steel skeleton.
(02:55)Traffickers smuggle cocaine across the border, into the hands of crack-cocaine addicts like 49 years old Loco.
(02:52)Producers Beverly and Derek Joubert explain the highs - and lows - of capturing zebras on film.
(01:12)Anxious to land a true giant, the scientist and the fishermen resume their debate… over bait.
(03:03)A pod of sperm whales enters the fishing net and starts eating the school of fish.
(01:16)The crew must quickly determine if the herring have feed in their stomachs, otherwise they must release the catch
(00:57)Returning to the past proves to be emotional for Reza as he recalls the exact moment he shot Massoud's portrait.
(02:40)Despite the dangers that await, many species are beginning their instinctual migratory treks through Africa.
(02:25)From poppy-flowers in Afghanistan to high-grade heroine on the streets of Vancouver. Here is where it starts.
(02:59)