Dr. Jan Pol has been a practicing veterinarian for more than half his life. In 1981 he and his wife, Diane, opened a vet business out of their home, and over the years it has grown to service more than 19,000 clients. Set in Central Michigan's farm country, this reality series follows the work done at Pol Veterinary Services. Specializing in large farm animals, Dr. Pol treats horses, pigs, cows, sheep, alpacas, goats, chickens and even an occasional reindeer. The program also features Dr. Brenda Grettenberger, who has worked with Dr. Pol since 1992.

When bears, wolves and foxes are your only neighbors, life can be pretty lonely. Add minus-60-degree days and a constant battle for the most basic necessities, and you have the daily challenges of people who live in remote corners of Alaska. This series takes viewers deep into an Alaskan winter to meet tough, resilient residents as they try to stay one step ahead of storms and man-eating beasts to survive the season. The closest neighbor to Sue Aikens is more than 300 miles away. Eric Salitan subsists solely on what he hunts and forages. Chip and Agnes Hailstone catch fish for currency in bartering for supplies, and Andy and Kate Bassich use their pack of sled dogs for transportation. Also highlighted is a time of year not always part of what viewers see in Alaska: spring! Ice is breaking, animals are waking, and residents face new tests before deep cold returns.

Investigating the world's most clever and savage predators.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through firsthand interviews and re-enactments terror-filled experiences of being arrested in a foreign country, usually for drug smuggling, and how they coped with the resulting lengthy prison terms. Viewers also hear from people directly involved with the arrests, whether it's the undercover agents gathering the evidence against the suspects, or the people making the drug dealing offers.

Put up your dukes -- er, paws -- and prepare to discover epic, bone-shattering clashes between some of the world's deadliest predators. From lions, tigers and bears to meerkats, mongoose and mice, the series features testosterone-induced battles between some of the biggest, baddest and often surprising fighters in the animal kingdom, revealing the extraordinary motivations and strategies that fuel each incredible brawl.

Silicon Valley circa 1990s was a technology breeding ground that attracted visionaries and charlatans alike, spawning some of the world's most influential people and recognizable brands. Set during that time, this six-part limited series follows the turbulent ride of three different companies whose founders were trying to change the world using the emergent technology of the internet. Creator, director and executive producer Matthew Carnahan ("House of Lies") employs a hybrid of scripted storytelling and documentary interviews with the key players whose stories are dramatized in the show. Emmy winner Bradley Whitford ("The West Wing") leads the ensemble cast.

Dream adventures turn into hellish nightmares for the travelers featured in this series, which recounts through first-hand interviews and re-enactments their experiences of being arrested in a foreign country for drug smuggling, and how they coped with the resulting lengthy prison terms.

This Emmy-nominated series is designed to mess with the ultimate supercomputer. Host Jason Silva reveals how brains process information related to topics like stress, addiction, competition, food, trust and language. Interactive games and hidden-camera experiments capture hilarious and shocking results, and viewers get real-world takeaways -- how to improve memory, get a better night's sleep, make more money -- to use in everyday situations.

Throughout America's coastline shark attacks are on the rise. Many occur in quick succession at new and surprising locations. As vacationers, scientists and locals are all desperate to uncover what is causing the upsurge, National Geographic Channel investigates the attacks to see what is affecting some of nature's most feared fish. The deep-sea saga employs underwater photography, news archives and testimony to deep dive into mysterious and deadly recent shark attacks.

Alaska's deadliest thrive in one of America's last wild frontiers.

One of the largest and most popular zoos in the U.S., Ohio's renowned Columbus Zoo and Aquarium and its conservation park The Wilds, houses more than 10,000 animals on 12,000 acres. It's also the part-time home of beloved wildlife guru Jack Hanna, the zoo's director emeritus. Now, Nat Geo Wild is taking viewers inside the grounds and allowing them to experience what visitors can't: compelling, heartwarming stories, and behind-the-scenes moments and adventures. "Secrets of the Zoo" introduces both the animals and the legions of workers who create unforgettable connections between people and wildlife.

This series helps change how people look at World War II thanks to hundreds of hours of video that have been declassified and fully restored in high definition. Soldiers on the front lines, secret operatives, resistance fighters, and private citizens shot the footage, some of which has never been seen, that gives viewers a firsthand look at what went on during times of battle. Episodes detail the battle over Stalingrad that was a key turning point in the war and show Japanese pilots on the morning of Dec., 7, 1941, preparing for the attack on Pearl Harbor.

National Geographic Channel's first late-night talk show stars renowned astrophysicist Neil deGrasse Tyson and is based on his popular podcast of the same name. The TV series' hourlong episodes provide a unique opportunity, Tyson says, to show how culturally pervasive and entertaining science can be. Guests including President Jimmy Carter, director Christopher Nolan, astronaut Chris Hadfield, journalist Arianna Huffington, actor George Takei and writer Norman Lear talk about topics like space travel, extraterrestrial life, the big-bang theory, the future of Earth and the environment. By bridging the intersection between pop culture and science, Tyson hopes to inspire everyone to "keep looking up."

Homeland Security at JFK International Airport deals with daily issues ranging from fraudulent visas to human trafficking.

Suspenseful nature stories begin just before sunset and end just after sunrise; from Costa Rica to Indonesia to the swamps across the United States, creatures of the night battle for survival when the sun goes down.

This series unveils the engineering secrets of various iconic megastructures that went on to spark a technological revolution, ultimately changing warfare forever. The Nazis built some of the biggest and deadliest pieces of military hardware in history. Adolf Hitler hired men like Wernher von Braun, Ferdinand Porsche and Alfred Krupp to build huge terror machines, high-tech superguns and weapons of mass destruction.

The daily and subsistence activities of the inhabitants of the most frigid areas on the planet.

Africa is home to some of the deadliest creatures of all, and in this series, you'll see them.

Personal stories of those caught up in sometimes deadly natural catastrophes, accompanied by camera footage showing meteorological phenomena, including hurricanes, earthquakes, monsoons and more.

Set in the Blue Ridge Mountains of Appalachia, "Southern Justice" documents -- in a cinema verite fashion -- the work of law enforcement agencies in Sullivan County, Tenn., and Ashe County, N.C. With a combined population of fewer than 200,000, both small counties have their local charm, but they also have their share of hardships. Methamphetamine, prescription drugs, and alcohol play a role in a large portion of local crimes. Incorporating a shared philosophy best described as"Andy Griffith in the 21st century," the sheriffs and their deputies are tasked with protecting these unique, close-knit communities, and they often must use a mixture of action and compassion. And if a peaceful solution proves impossible, both agencies are ready with SWAT teams to handle the most violent situations.

Enhanced episodes of "The Incredible Dr. Pol."