Eco-innovators introduce Zac and Darin to unique and cost-effective ways to address complex problems and help heal the environment.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Sue gets sidelined by technical issues; the Hailstones buckle down in the face of mother nature; Jessie and Glen find food and resources.

During the gold rush, prospectors from all over flock to the Klondike to try their hand at finding their fortune; Brett and Cliff build a rudimentary riverboat to float to the prime gold-panning locations.

From the bone-dry deserts of the Atacama, where penguins weave their way through a minefield of snapping sea lions, to the lush cloud forests of the Andes, South America is full of unusual and ingenious wildlife.

Sue gets sidelined by technical issues; the Hailstones buckle down in the face of mother nature; Jessie and Glen find food and resources.

Hope fights a problem that kills millions of birds each year in Chicago.

Examine strange relics forgotten by time. Visit a perturbing circle of stone in the Golan Heights, a mountain of headless statues in Turkey, a castle left to crumble in the Saudi Arabian desert, and a time-worn secret in the wilds of Peru.

Scientists work to find ways to safeguard Earth from potential threats posed by asteroids and other cosmic debris.

Hope fights a problem that kills millions of birds each year in Chicago.

Examine strange relics forgotten by time. Visit a perturbing circle of stone in the Golan Heights, a mountain of headless statues in Turkey, a castle left to crumble in the Saudi Arabian desert, and a time-worn secret in the wilds of Peru.

Scientists work to find ways to safeguard Earth from potential threats posed by asteroids and other cosmic debris.

Hope fights a problem that kills millions of birds each year in Chicago.

Alaskans move into high gear to stock up for the winter months.

The Grand Banks off the coast of Newfoundland have been contested waters for hundreds of years, as the earliest cod fishermen build a thriving fishing industry; Brett and Cliff take on the North Atlantic as they try their hand at cod fishing.

Eco-innovators introduce Zac and Darin to unique and cost-effective ways to address complex problems and help heal the environment.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

Alaskans move into high gear to stock up for the winter months.

Asia is the largest and most extreme continent on the planet, stretching from the Arctic Circle to the tropical forests on the Equator.

A race to find the planet's 60 deadliest creatures.

Steve heads to Suriname, a country with more forest than anywhere else on Earth; he kayaks upriver in search of some deadly critters.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

A race to find the planet's 60 deadliest creatures.

Steve heads to Suriname, a country with more forest than anywhere else on Earth; he kayaks upriver in search of some deadly critters.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

Alaskans move into high gear to stock up for the winter months.

The Grand Banks off the coast of Newfoundland have been contested waters for hundreds of years, as the earliest cod fishermen build a thriving fishing industry; Brett and Cliff take on the North Atlantic as they try their hand at cod fishing.

Asia is the largest and most extreme continent on the planet, stretching from the Arctic Circle to the tropical forests on the Equator.

Alaskans move into high gear to stock up for the winter months.

A mysterious predator prowls the streets of a giant metropolis.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

The 2008 Super Tuesday tornado outbreak is investigated to see why the storms occurred mid-winter and why tornados remain so enigmatic.

A mysterious predator prowls the streets of a giant metropolis.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

The 2008 Super Tuesday tornado outbreak is investigated to see why the storms occurred mid-winter and why tornados remain so enigmatic.

A mysterious predator prowls the streets of a giant metropolis.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

During prohibition, men would regularly risk their lives to transport the goods; with the Great Lakes as the backdrop for this endeavour many men were lost; Brett and Cliff try their hands at bootlegging.

A race to find the planet's 60 deadliest creatures.

Steve heads to Suriname, a country with more forest than anywhere else on Earth; he kayaks upriver in search of some deadly critters.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

High above the city of Gibraltar, Barbary macaques, Europe's only non-human primates, live lives full of kidnappings and high drama; in the cemeteries of Vienna Grave Robbing European hamsters do battle with each other for food.

The cubs' mother loses patience as they learn to hunt on their own.

There are not five separate oceans, but one; its waters linked by powerful forces that keep them on the move.

In many of the world's natural wonders there is an abundance of animals, which can either be a threat to the people who live there or provide a means of survival.

The cubs' mother loses patience as they learn to hunt on their own.

There are not five separate oceans, but one; its waters linked by powerful forces that keep them on the move.

In many of the world's natural wonders there is an abundance of animals, which can either be a threat to the people who live there or provide a means of survival.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

During prohibition, men would regularly risk their lives to transport the goods; with the Great Lakes as the backdrop for this endeavour many men were lost; Brett and Cliff try their hands at bootlegging.

High above the city of Gibraltar, Barbary macaques, Europe's only non-human primates, live lives full of kidnappings and high drama; in the cemeteries of Vienna Grave Robbing European hamsters do battle with each other for food.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

Hope gets hurt; an owl gets a nasty welcome back to the wild.

Take a deep dive into watery enigmas. Glide over a sunken Italian city, a unique underwater cemetery in the Florida Keys, a yellow brick road to nowhere in the depths of the South Pacific, and puzzling rocky constructions off the coast of Australia.

A team of astronomers determine the ultimate fate of Earth, several billion years from now.

Hope gets hurt; an owl gets a nasty welcome back to the wild.

Take a deep dive into watery enigmas. Glide over a sunken Italian city, a unique underwater cemetery in the Florida Keys, a yellow brick road to nowhere in the depths of the South Pacific, and puzzling rocky constructions off the coast of Australia.

A team of astronomers determine the ultimate fate of Earth, several billion years from now.

Hope gets hurt; an owl gets a nasty welcome back to the wild.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

As pioneers settled North America, many ventured to find their own piece of paradise in the remote wilderness; homesteaders aim was to build a home for their families to grow and flourish; Brett and Cliff are determined they have what it takes.

The cubs' mother loses patience as they learn to hunt on their own.

There are not five separate oceans, but one; its waters linked by powerful forces that keep them on the move.

In many of the world's natural wonders there is an abundance of animals, which can either be a threat to the people who live there or provide a means of survival.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

As the sun fades across the land, Alaskans brace for Dark Winter's return.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

As the sun fades across the land, Alaskans brace for Dark Winter's return.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

As pioneers settled North America, many ventured to find their own piece of paradise in the remote wilderness; homesteaders aim was to build a home for their families to grow and flourish; Brett and Cliff are determined they have what it takes.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Hope and Dr. Barry journey to Central America to meet frontline wildlife rescuers in the jungles of Costa Rica.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Missions are heading to Jupiter to discover how planets form and to find out if there is life on the planets four largest moons.

Hope and Dr. Barry journey to Central America to meet frontline wildlife rescuers in the jungles of Costa Rica.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Missions are heading to Jupiter to discover how planets form and to find out if there is life on the planets four largest moons.

Hope and Dr. Barry journey to Central America to meet frontline wildlife rescuers in the jungles of Costa Rica.

Alaskans get a brief respite from winter's fury with the end of the thaw.

Brett and Cliff aim to put themselves through the experience of losing one's ship and needing to be rescued.

As the sun fades across the land, Alaskans brace for Dark Winter's return.

A giant crack in the ice continues to be an obstacle for all crews as they try to set nets in deeper water; Mike and Justin are caught flat-footed when the crack shifts and sends a violent ice quake to shake their location.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Alaskans get a brief respite from winter's fury with the end of the thaw.

Icy Antarctica is a land of survivors enduring the most hostile conditions on Earth.

The Australian outback is covered in pale spots, the work of wombats; a clearing in the green canopy of the Congo rainforest has been created by an elephant gathering; the twists and turns of the Amazon make a home for rehabilitated manatees.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

The Australian outback is covered in pale spots, the work of wombats; a clearing in the green canopy of the Congo rainforest has been created by an elephant gathering; the twists and turns of the Amazon make a home for rehabilitated manatees.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

Alaskans get a brief respite from winter's fury with the end of the thaw.

Brett and Cliff aim to put themselves through the experience of losing one's ship and needing to be rescued.

Icy Antarctica is a land of survivors enduring the most hostile conditions on Earth.

Alaskans get a brief respite from winter's fury with the end of the thaw.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

The Cassini-Huygens spacecraft has been sending images and a wealth of scientific revelations from Saturn's orbit since 2004.

Peek at landmarks in places where they shouldn't be; wing your way over an imperial pyramid in the Netherlands, a metal sphere in remote Russia, a lion shape carved into an English hillside and a bare swath cut through an Austrian forest.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

Missions are heading to Jupiter to discover how planets form and to find out if there is life on the planets four largest moons.

Confront objects that make no sense; spot a spinning island in an Argentinian marsh, a colossal triangle stuck in the Arizona desert, mysterious multicoloured pools across northern Ethiopia and a huge human figure hidden in the Australian outback.

New York's Hudson River stretches 315 miles through natural landscapes, from the Adirondack Mountains to the George Washington Bridge and Statue of Liberty.

The cubs' mother loses patience as they learn to hunt on their own.

From the bone-dry deserts of the Atacama, where penguins weave their way through a minefield of snapping sea lions, to the lush cloud forests of the Andes, South America is full of unusual and ingenious wildlife.

Asia is the largest and most extreme continent on the planet, stretching from the Arctic Circle to the tropical forests on the Equator.

High above the city of Gibraltar, Barbary macaques, Europe's only non-human primates, live lives full of kidnappings and high drama; in the cemeteries of Vienna Grave Robbing European hamsters do battle with each other for food.

Icy Antarctica is a land of survivors enduring the most hostile conditions on Earth.

Global conservationist Dr. M Sanjayan is in California, as it suffers the longest dry period in a thousand years.

As the sun fades across the land, Alaskans brace for Dark Winter's return.

Found on every continent, mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

Professor Cox explores the cycles of time that define the lives of humans.

Steve joins forces with shark scientist Mauricio Hoyos to discover where shark mothers give birth and help protect a new generation of these ocean giants in the Eastern Pacific.

The Cassini-Huygens spacecraft has been sending images and a wealth of scientific revelations from Saturn's orbit since 2004.

Hope gets hurt; an owl gets a nasty welcome back to the wild.

Psychedelic swirls in the Utah wastelands; a bizarre configuration of circles in the Sahara; hidden lines with the help of a drone; a remote polka-dot lake in Canada.

Found on every continent, mountains create unique frozen worlds, home to extraordinary animals that must overcome the crushing conditions of the cold.

The Australian outback is covered in pale spots, the work of wombats; a clearing in the green canopy of the Congo rainforest has been created by an elephant gathering; the twists and turns of the Amazon make a home for rehabilitated manatees.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

Scientists work to find ways to safeguard Earth from potential threats posed by asteroids and other cosmic debris.

Examine strange relics forgotten by time. Visit a perturbing circle of stone in the Golan Heights, a mountain of headless statues in Turkey, a castle left to crumble in the Saudi Arabian desert, and a time-worn secret in the wilds of Peru.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

A team of astronomers determine the ultimate fate of Earth, several billion years from now.

Take a deep dive into watery enigmas. Glide over a sunken Italian city, a unique underwater cemetery in the Florida Keys, a yellow brick road to nowhere in the depths of the South Pacific, and puzzling rocky constructions off the coast of Australia.

Bill Nighy narrates a trip along the River Po, traveling across northern Italy from the snow-capped Alps to the delta where it meets the Adriatic Sea.

The Australian outback is covered in pale spots, the work of wombats; a clearing in the green canopy of the Congo rainforest has been created by an elephant gathering; the twists and turns of the Amazon make a home for rehabilitated manatees.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

Levison resumes his journey in Nepal, visiting a crash site 150 meters down a steep cliff.

Accompanied by his old friend and guide Binod, Levison tracks the mountains from eastern Nepal into the country of Bhutan.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

A race to find the planet's 60 deadliest creatures.

Steve heads to Suriname, a country with more forest than anywhere else on Earth; he kayaks upriver in search of some deadly critters.

The cubs' mother loses patience as they learn to hunt on their own.

Innovative efforts to confront climate change in Australia, Brazil, California and Kenya; with Dr. M. Sanjayan.

Brian learns how Saturn began its life as a strange planet of rock and ice, born outside the snow line, with an abundance of building materials.

There are not five separate oceans, but one; its waters linked by powerful forces that keep them on the move.

Innovative efforts to confront climate change in Australia, Brazil, California and Kenya; with Dr. M. Sanjayan.

Brian learns how Saturn began its life as a strange planet of rock and ice, born outside the snow line, with an abundance of building materials.

There are not five separate oceans, but one; its waters linked by powerful forces that keep them on the move.

Innovative efforts to confront climate change in Australia, Brazil, California and Kenya; with Dr. M. Sanjayan.

Alaskans have to divide and conquer to stockpile resources for the long winter ahead.

As summer comes to an end, Alaskans make one last push to prepare for the brutal winter ahead.

Alaskans get a brief respite from winter's fury with the end of the thaw.

Hope and Dr. Barry discover a horrifying problem in Costa Rica where man and monkey cross paths.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

Scientists explore how to protect the earth when solar storms destroy earthbound technologies and send satellites crashing to earth.

Hope and Dr. Barry discover a horrifying problem in Costa Rica where man and monkey cross paths.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

The sudden release of built-up magnetic energy in the solar atmosphere - a solar storm - affects Earth.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

Levison begins his journey in Afghanistan's remote and inhospitable Wakhan Corridor.

Levison takes in the scenery in northern Pakistan's mountain valleys.

Levison reunites with his old friend Binod Parya who once saved his life.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

Africa is home to the greatest collection of wildlife on Earth, with a vast tropical rainforest full of life at its heart, but animals face big challenges in this land of plenty.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

From Sydney to the Greater Blue Mountains, Zach and Darin meet with leading eco-warriors to learn about protected lands and habitat conservation.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

Lev and his guide Boston are 1100 miles and four months into their journey, in the world's newest nation, South Sudan; arriving in the capital, Juba, Lev and Boston are arrested by secret police.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

Ranchers would hire cowpokes to deliver their cattle when it was time to take the animals to market; Brett and Cliff to test their mettle in the unforgiving landscape of the Southwest.

Africa is home to the greatest collection of wildlife on Earth, with a vast tropical rainforest full of life at its heart, but animals face big challenges in this land of plenty.

Winter bears down on Alaskans, who make last-minute preparations for the return of the freeze.

A bird is in trouble, but is it wildlife? Spring patients are ready to return to the wild.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

The sudden release of built-up magnetic energy in the solar atmosphere - a solar storm - affects Earth.

A bird is in trouble, but is it wildlife? Spring patients are ready to return to the wild.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

The sudden release of built-up magnetic energy in the solar atmosphere - a solar storm - affects Earth.

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

A race to find the planet's 60 deadliest creatures.

Steve takes a special journey to meet pangolins, the most trafficked animals on the planet, and the people who work tirelessly to save them.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

Innovative efforts to confront climate change in Australia, Brazil, California and Kenya; with Dr. M. Sanjayan.

A race to find the planet's 60 deadliest creatures.

Steve takes a special journey to meet pangolins, the most trafficked animals on the planet, and the people who work tirelessly to save them.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

Innovative efforts to confront climate change in Australia, Brazil, California and Kenya; with Dr. M. Sanjayan.

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

A look at Isaac Newton;a visit to CERN.

A journey from the heat of the tropics to the planet's frozen poles; life has spread to almost every part of the ocean, but there are many different worlds within it and each presents unique challenges.

Alaskans work to prepare for the upcoming brutal weather; Chip constructs a mobile tent frame.

The rehab is abuzz as Hope's open house approaches; a release at the birthplace of hockey goes offside; a deer doesn't want to depart.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

The diamond's rise from gemstone to a cutting-edge material that is set to revolutionize electronics.

The rehab is abuzz as Hope's open house approaches; a release at the birthplace of hockey goes offside; a deer doesn't want to depart.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

The diamond's rise from gemstone to a cutting-edge material that is set to revolutionize electronics.

In 1989, a ferocious explosion on the sun's surface released a cloud of highly charged particles containing the energy of 20 million nuclear bombs, and this solar superstorm then hit Earth; in Quebec, Canada, the lights suddenly went out.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

In 1989, a ferocious explosion on the sun's surface released a cloud of highly charged particles containing the energy of 20 million nuclear bombs, and this solar superstorm then hit Earth; in Quebec, Canada, the lights suddenly went out.

The space telescope Hipparcos led to a discovery that sent shockwaves throughout the astronomical community: a star appearing to be older than the universe itself.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

An epic journey into the unknown, a realm that feels almost like science fiction.

Gordon Buchanan joins Dr. Victor Lukarevsky in Russia to attempt to rehabilitate two pairs of lynx held captive for years.

Humans are changing our planet so rapidly, it's affecting earth's life support systems: our weather, our oceans and the living world.

In some natural wonders people push themselves to the limit, and survival requires skill, ingenuity and bravery.

Gordon Buchanan joins Dr. Victor Lukarevsky in Russia to attempt to rehabilitate two pairs of lynx held captive for years.

Humans are changing our planet so rapidly, it's affecting earth's life support systems: our weather, our oceans and the living world.

In some natural wonders people push themselves to the limit, and survival requires skill, ingenuity and bravery.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

An epic journey into the unknown, a realm that feels almost like science fiction.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Hope scrambles to save the animals when a burglar busts down the door to the rehab, as the spring baby boom brings in a flood of injured and orphaned animals.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

Scientists explore whether Earth's estranged twin Venus could be a vision of our planet's future.

Hope scrambles to save the animals when a burglar busts down the door to the rehab, as the spring baby boom brings in a flood of injured and orphaned animals.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

Scientists explore whether Earth's estranged twin Venus could be a vision of our planet's future.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.