An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

With food in abundance it's a time of plenty in the Serengeti; a series of unexpected events turns families against each other and stretches relationships to breaking point.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

Extreme locales include Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

Extreme locales include Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

Analyze the ways in which cold has shaped the physical world, and learn why the definition of frozen may require an update; meet scientists pushing frigid temps to their absolute limit, driving technological developments such as superconductors.

With food in abundance it's a time of plenty in the Serengeti; a series of unexpected events turns families against each other and stretches relationships to breaking point.

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

A long-forgotten network of Native American earthworks, a baffling battlefield mystery in Belgium, a mysterious blood red lake on a remote Greek island, and an eerie pink glow emulating form the middle of the Pacific Ocean.

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.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

A long-forgotten network of Native American earthworks, a baffling battlefield mystery in Belgium, a mysterious blood red lake on a remote Greek island, and an eerie pink glow emulating form the middle of the Pacific Ocean.

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.

Hope and Dr. Barry have their hands full wrangling five baby black bears.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

Extreme locales include Mount Everest's Khumbu Icefall, the Grand Canyon, and the slopes of Mount Kilimanjaro.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

The warm season provides for Alaskans.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

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

The warm season provides for Alaskans.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

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

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

The first fawn of the year arrives at the rehab centre; two volunteers plan to make rehab a lifelong commitment.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

The warm season provides for Alaskans.

While some fishers struggle to finish the fall season in wild weather, the Kristjansons make a pilgrimage to their ancestral home, Iceland; back home, an early winter storm slams Gimli and commercial fishers risk life and limb.

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

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

It's January, and the Ice Vikings confront blizzards and bone-crushing cold on a lake that refuses to freeze solid; Trevor is having a terrible season, and he joins Chris at their basecamp near the Narrows, which leads to tension.

Caleb Musgrave teaches the Adventurers proper shelter construction.

After a long paddle, Caleb and Brendan learn the art of net-making.

Griff explores the prairies and vast plains of Saskatchewan and Alberta provinces; he discovers that they hide a diversity of riches, from ancient buffalo herds to dinosaur fossils and acres of cultivated farmland.

It's January, and the Ice Vikings confront blizzards and bone-crushing cold on a lake that refuses to freeze solid; Trevor is having a terrible season, and he joins Chris at their basecamp near the Narrows, which leads to tension.

Caleb Musgrave teaches the Adventurers proper shelter construction.

After a long paddle, Caleb and Brendan learn the art of net-making.

Griff explores the prairies and vast plains of Saskatchewan and Alberta provinces; he discovers that they hide a diversity of riches, from ancient buffalo herds to dinosaur fossils and acres of cultivated farmland.

Contemporary issues in science are explored.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

Coasts are the most changeable habitats of the ocean world.

Pioneers strive to protect the ocean from the effects of human activity.

With food in abundance it's a time of plenty in the Serengeti; a series of unexpected events turns families against each other and stretches relationships to breaking point.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

The warm season provides for Alaskans.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

With scientists sending space probes to the furthest reaches of the solar system and beyond, the scientific search for alien life has begun; inspired by a childhood love of science fiction, Brian still hopes to hear from ET.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Polar landscapes in autumn are transformed as the big freeze returns; in the Arctic, polar bears gather in large numbers on the coast to wait for the return of the ice; off the coast 2,000 beluga whales head for a special estuary.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

Helen Czerski reveals how life began when hot met cold, and how every single living creature on Earth depends on temperature for its survival; she witnesses the remarkable surgery that uses temperature to push the human body to the brink of life.

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 Gabriella feels the effects of a lack of food, Elder Mary arrives with a gift and a teaching.

The Adventurers try bush sushi, paddle to a new island in search of food, and Gabriella is rescued on the open water.

Griff uncovers what it is about living in the Pacific Northwest that makes people strive for happiness and what he learned on his journey across Canada.

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 Gabriella feels the effects of a lack of food, Elder Mary arrives with a gift and a teaching.

The Adventurers try bush sushi, paddle to a new island in search of food, and Gabriella is rescued on the open water.

Griff uncovers what it is about living in the Pacific Northwest that makes people strive for happiness and what he learned on his journey across Canada.

The warm season provides for Alaskans.

Contemporary issues in science are explored.

An exploration of the faint band of light that sweeps across the night sky, the Milky Way; Professor Brian Cox reveals the Milky Way's dramatic history and predicts its cataclysmic future.

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

Levison and Alberto begin their journey on the northern shores of Mexico's Yucatan Peninsula.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

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

Bonus footage from throughout the series, including a race with a cheetah, a cute but deadly bird, and a king cobra rescue; rare occasions when things do not go to plan.

Behind nature's winter wonderland are some of the toughest places to survive. Hidden cameras in a new generation of Spy Creatures reveal the fascinating behaviors of animals from penguins to parrots, polar bears to otters, wallabies, and wombats.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

As the Serengeti starts to dry out, competition heats up between the families; the strong females take center stage, dealing with headstrong males and fighting for the survival of their kin.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

The secretive lives of mountain animals; snow leopards come together to help a mother and cub, trapped between rival males.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

As the summer begins to fade, Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead.

As the thaw draws to a close, Alaskans maximize their final days of sunlight in the Arctic.

Learning the secret of rehabilitating seals from experts at Vancouver Aquarium; search and rescue is launched.

Revealing the truth behind the planet's ancient legends; touring an island covered in polar bears, twin craters in Greece, peeking at a supervolcano hidden under Yellowstone Park and examining an ocean formation that's eerily similar to Atlantis.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

Learning the secret of rehabilitating seals from experts at Vancouver Aquarium; search and rescue is launched.

Revealing the truth behind the planet's ancient legends; touring an island covered in polar bears, twin craters in Greece, peeking at a supervolcano hidden under Yellowstone Park and examining an ocean formation that's eerily similar to Atlantis.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

Learning the secret of rehabilitating seals from experts at Vancouver Aquarium; search and rescue is launched.

Preparation for winter is in full swing as the fall season reaches the Arctic; Sue searches for food; Andy and Kate race to get their fish wheel turning; the Hailstones build a cache for storing meat before their annual caribou hunt.

Hannah gains access to a top-secret site where anonymous staff and the latest tech work to make the British passport one of the most secure documents on the planet; she reveals the World War I spy craft hidden in the pages of every passport.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

Kayaking the white water of the Russian peninsula of Kamchatka; examining brown bears in the wilderness.

Preparation for winter is in full swing as the fall season reaches the Arctic; Sue searches for food; Andy and Kate race to get their fish wheel turning; the Hailstones build a cache for storing meat before their annual caribou hunt.

The anticipation of the annual Great Migration is being felt by all of the Serengeti's families as they wait with great desperation for it to arrive; the land continues to get hotter and hunger starts to bite as food becomes even more scarce.

Searching for ways to minimize their carbon footprints, Zac and Darin visit a self-sustaining home and other business innovating to reduce waste.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Searching for ways to minimize their carbon footprints, Zac and Darin visit a self-sustaining home and other business innovating to reduce waste.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Preparation for winter is in full swing as the fall season reaches the Arctic; Sue searches for food; Andy and Kate race to get their fish wheel turning; the Hailstones build a cache for storing meat before their annual caribou hunt.

Hannah gains access to a top-secret site where anonymous staff and the latest tech work to make the British passport one of the most secure documents on the planet; she reveals the World War I spy craft hidden in the pages of every passport.

The anticipation of the annual Great Migration is being felt by all of the Serengeti's families as they wait with great desperation for it to arrive; the land continues to get hotter and hunger starts to bite as food becomes even more scarce.

Preparation for winter is in full swing as the fall season reaches the Arctic; Sue searches for food; Andy and Kate race to get their fish wheel turning; the Hailstones build a cache for storing meat before their annual caribou hunt.

Hope recruits an unlikely wildlife rescuer.

Walking among colossal wonders scattered across the Earth's surface, including an ancient reptile skeleton, a massive head carving in the Alberta badlands, a giant South African footprint and a pentagram etched into a remote peninsula in Kazakhstan.

A journey down Spain's Guadalquivir River, from the high Sierra de Cazorla down to Andalusia; passing through Cordoba and Seville, following the footsteps of Columbus and Magellan.

Hope recruits an unlikely wildlife rescuer.

Walking among colossal wonders scattered across the Earth's surface, including an ancient reptile skeleton, a massive head carving in the Alberta badlands, a giant South African footprint and a pentagram etched into a remote peninsula in Kazakhstan.

A journey down Spain's Guadalquivir River, from the high Sierra de Cazorla down to Andalusia; passing through Cordoba and Seville, following the footsteps of Columbus and Magellan.

Hope recruits an unlikely wildlife rescuer.

Alaskans prepare themselves for winter; hunting caribou; a bear poses a threat; repairing a fish wheel; hauling a felled moose.

Hannah takes a look at the vacuum cleaner; she goes behind the scenes with Dyson and discovers how the motor in their latest vacuum spins nine times faster than that of a Formula One race car.

Searching for ways to minimize their carbon footprints, Zac and Darin visit a self-sustaining home and other business innovating to reduce waste.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

Levison and Alberto visit the landscapes, colonial cities, active volcanoes and mountains of Nicaragua and Costa Rica.

Alaskans prepare themselves for winter; hunting caribou; a bear poses a threat; repairing a fish wheel; hauling a felled moose.

The long-awaited arrival of the Great Migration brings opportunities and food in abundance, but it also increases conflict as every one of the Serengeti's families is put to the test.

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

Steve is in search of bait balls; these wildlife events can be seen from space, but they are not easy to find.

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.

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

Steve is in search of bait balls; these wildlife events can be seen from space, but they are not easy to find.

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.

Alaskans prepare themselves for winter; hunting caribou; a bear poses a threat; repairing a fish wheel; hauling a felled moose.

Hannah takes a look at the vacuum cleaner; she goes behind the scenes with Dyson and discovers how the motor in their latest vacuum spins nine times faster than that of a Formula One race car.

The long-awaited arrival of the Great Migration brings opportunities and food in abundance, but it also increases conflict as every one of the Serengeti's families is put to the test.

Alaskans prepare themselves for winter; hunting caribou; a bear poses a threat; repairing a fish wheel; hauling a felled moose.

Allison and Barry try to shampoo a porcupine; a returning patient is released.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

Discover the stories of six epic river journeys via the fascinating characters who live and work on and around the water.

Allison and Barry try to shampoo a porcupine; a returning patient is released.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

Discover the stories of six epic river journeys via the fascinating characters who live and work on and around the water.

Allison and Barry try to shampoo a porcupine; a returning patient is released.

Alaskans prepare for the winter months; Andy hunts moose; Sue heads to Fairbanks for a foot procedure; the hailstones teach their daughters to ice fish; Glenn repairs his cabin.

With over six billion of them across the planet, smartphones have changed the modern world; with rare access to electronics giant Samsung, Hannah uncovers the technological game changers that have made the smartphone a reality.

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

Steve is in search of bait balls; these wildlife events can be seen from space, but they are not easy to find.

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.

Alaskans prepare for the winter months; Andy hunts moose; Sue heads to Fairbanks for a foot procedure; the hailstones teach their daughters to ice fish; Glenn repairs his cabin.

The dry season is now upon the animals of the Serengeti, turning the waterhole into a death trap for the herds, but for some this season is a gift.

The four categories of cute in the animal kingdom and the scientific stories behind why animals are cute.

Without volcanoes, life on Earth would never have begun; they are responsible for both the planet's breathable atmosphere and the oceans; mineral-rich ash from regular eruptions fertilize the land.

Wonders created by the power of water include Victoria Falls, where men take risks to reach fishing pools; the Camargue, where a man duels with a bull; ocean reefs.

The four categories of cute in the animal kingdom and the scientific stories behind why animals are cute.

Without volcanoes, life on Earth would never have begun; they are responsible for both the planet's breathable atmosphere and the oceans; mineral-rich ash from regular eruptions fertilize the land.

Wonders created by the power of water include Victoria Falls, where men take risks to reach fishing pools; the Camargue, where a man duels with a bull; ocean reefs.

Alaskans prepare for the winter months; Andy hunts moose; Sue heads to Fairbanks for a foot procedure; the hailstones teach their daughters to ice fish; Glenn repairs his cabin.

With over six billion of them across the planet, smartphones have changed the modern world; with rare access to electronics giant Samsung, Hannah uncovers the technological game changers that have made the smartphone a reality.

The dry season is now upon the animals of the Serengeti, turning the waterhole into a death trap for the herds, but for some this season is a gift.

Alaskans prepare for the winter months; Andy hunts moose; Sue heads to Fairbanks for a foot procedure; the hailstones teach their daughters to ice fish; Glenn repairs his cabin.

Hope and Allison look to gain more experience with pelicans by heading to southern California.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

Hope and Allison look to gain more experience with pelicans by heading to southern California.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Rumoured to be the cleanest river in Europe, few dispute it's the coldest; cascading down from the Dinaric Alps in Serbia, it soon crosses the border into Bosnia Herzegovina, where marine biologist and fisherman Sanel Riđanović casts for salmon.

Hope and Allison look to gain more experience with pelicans by heading to southern California.

Sue travels 150 miles to investigate squatters on her property; Andy's sled begins to fall apart while he's collecting firewood; Chip and Agnes brave thin ice to harvest whitefish.

Hannah Fry discovers the hidden WWII radar technology that heats up baked beans; she learns the legend of the melted candy bar in an engineer's pocket that kick-started a kitchen revolution; she demonstrates why microwaves zap food but not people.

The four categories of cute in the animal kingdom and the scientific stories behind why animals are cute.

Without volcanoes, life on Earth would never have begun; they are responsible for both the planet's breathable atmosphere and the oceans; mineral-rich ash from regular eruptions fertilize the land.

Wonders created by the power of water include Victoria Falls, where men take risks to reach fishing pools; the Camargue, where a man duels with a bull; ocean reefs.

Sue travels 150 miles to investigate squatters on her property; Andy's sled begins to fall apart while he's collecting firewood; Chip and Agnes brave thin ice to harvest whitefish.

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.

In summer's home stretch, family ties run deep; Cole hunts for protein in the rain; Jessie gathers the last of the warm weather bounty; the Hailstones track shy prey; Ricko's legacy project.

Chris starts his season with a massive catch of Tullibee, only to see his happiness cut short; Justin and Mike start in Hecla and hit the motherlode; a critical fish market closes; Richard's close call on the ice.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

In summer's home stretch, family ties run deep; Cole hunts for protein in the rain; Jessie gathers the last of the warm weather bounty; the Hailstones track shy prey; Ricko's legacy project.

Chris starts his season with a massive catch of Tullibee, only to see his happiness cut short; Justin and Mike start in Hecla and hit the motherlode; a critical fish market closes; Richard's close call on the ice.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

Sue travels 150 miles to investigate squatters on her property; Andy's sled begins to fall apart while he's collecting firewood; Chip and Agnes brave thin ice to harvest whitefish.

Hannah Fry discovers the hidden WWII radar technology that heats up baked beans; she learns the legend of the melted candy bar in an engineer's pocket that kick-started a kitchen revolution; she demonstrates why microwaves zap food but not people.

Chris starts his season with a massive catch of Tullibee, only to see his happiness cut short; Justin and Mike start in Hecla and hit the motherlode; a critical fish market closes; Richard's close call on the ice.

Sue travels 150 miles to investigate squatters on her property; Andy's sled begins to fall apart while he's collecting firewood; Chip and Agnes brave thin ice to harvest whitefish.

Hope learns all she can from a birds of prey rehab.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

Hope learns all she can from a birds of prey rehab.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

Hope learns all she can from a birds of prey rehab.

Chip builds a freight sled for winter travel; Sue is forced to brave a dangerous road to get home after a blizzard strands her in Fairbanks; Andy and Kate get their sled dogs ready for winter; Glenn tries to harvest meat for the winter.

Hannah Fry visits headphone honchos Bose to find out how the teeny earbud tech works and meets the human testers with "golden ears.".

In summer's home stretch, family ties run deep; Cole hunts for protein in the rain; Jessie gathers the last of the warm weather bounty; the Hailstones track shy prey; Ricko's legacy project.

Chris starts his season with a massive catch of Tullibee, only to see his happiness cut short; Justin and Mike start in Hecla and hit the motherlode; a critical fish market closes; Richard's close call on the ice.

Levison and Alberto travel through Guatemala, Honduras and Nicaragua.

Chip builds a freight sled for winter travel; Sue is forced to brave a dangerous road to get home after a blizzard strands her in Fairbanks; Andy and Kate get their sled dogs ready for winter; Glenn tries to harvest meat for the winter.

It's time to close another chapter in the lives of the animals of the Serengeti; first, all around is a blackened wasteland, the aftermath of the huge fire.

The Trappist-1 stellar system is home to seven Earth-like planets, and one of them could harbor life; rival teams of visionary pioneers use data to extrapolate entire worlds, leading the search for life on other planets throughout the universe.

Challenging the concept of reality with new data from a supermassive black hole.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

The Trappist-1 stellar system is home to seven Earth-like planets, and one of them could harbor life; rival teams of visionary pioneers use data to extrapolate entire worlds, leading the search for life on other planets throughout the universe.

Challenging the concept of reality with new data from a supermassive black hole.

Dr. Helen Czerski reveals how the harnessing of heat's power to transform matter has led to some of humanity's greatest achievements, from molten metal that enabled us to make tools to the searing heat of plasmas that offer near unlimited power.

Chip builds a freight sled for winter travel; Sue is forced to brave a dangerous road to get home after a blizzard strands her in Fairbanks; Andy and Kate get their sled dogs ready for winter; Glenn tries to harvest meat for the winter.

Hannah Fry visits headphone honchos Bose to find out how the teeny earbud tech works and meets the human testers with "golden ears.".

It's time to close another chapter in the lives of the animals of the Serengeti; first, all around is a blackened wasteland, the aftermath of the huge fire.

Chip builds a freight sled for winter travel; Sue is forced to brave a dangerous road to get home after a blizzard strands her in Fairbanks; Andy and Kate get their sled dogs ready for winter; Glenn tries to harvest meat for the winter.

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Tempers flare as hunger, exhaustion, and no reprieve from one another pushes someone past the point of no return.

Michela, Brendan and Caleb struggle on the water as they make way to a new camp; a medicine woman brings the group knowledge and insights.

Griff uncovers what makes Newfoundland and Labrador unique, from tiny islands, sea shanties and cods tongues to jellybean houses and noonday canons, while discovering its bigness in land, dogs and the hospitality of its people.

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Tempers flare as hunger, exhaustion, and no reprieve from one another pushes someone past the point of no return.

Michela, Brendan and Caleb struggle on the water as they make way to a new camp; a medicine woman brings the group knowledge and insights.

Griff uncovers what makes Newfoundland and Labrador unique, from tiny islands, sea shanties and cods tongues to jellybean houses and noonday canons, while discovering its bigness in land, dogs and the hospitality of its people.

The Trappist-1 stellar system is home to seven Earth-like planets, and one of them could harbor life; rival teams of visionary pioneers use data to extrapolate entire worlds, leading the search for life on other planets throughout the universe.

The four categories of cute in the animal kingdom and the scientific stories behind why animals are cute.

The anticipation of the annual Great Migration is being felt by all of the Serengeti's families as they wait with great desperation for it to arrive; the land continues to get hotter and hunger starts to bite as food becomes even more scarce.

The long-awaited arrival of the Great Migration brings opportunities and food in abundance, but it also increases conflict as every one of the Serengeti's families is put to the test.

The dry season is now upon the animals of the Serengeti, turning the waterhole into a death trap for the herds, but for some this season is a gift.

It's time to close another chapter in the lives of the animals of the Serengeti; first, all around is a blackened wasteland, the aftermath of the huge fire.