In this two-hour special, renowned paleontologist Kirk Johnson takes us on an epic adventure through time at the polar extremes of our planet. Following a trail of strange fossils found in all the wrong places-beech trees in Antarctica, hippo-like mammals in the Arctic-Johnson uncovers the bizarre history of the poles, from miles-high ice sheets to warm polar forests teeming with life. What caused such dramatic changes at the ends of the Earth? And what can the past reveal about our planet's climate today-and in the future?

In this two-hour special, renowned paleontologist Kirk Johnson takes us on an epic adventure through time at the polar extremes of our planet. Following a trail of strange fossils found in all the wrong places-beech trees in Antarctica, hippo-like mammals in the Arctic-Johnson uncovers the bizarre history of the poles, from miles-high ice sheets to warm polar forests teeming with life. What caused such dramatic changes at the ends of the Earth? And what can the past reveal about our planet's climate today-and in the future?

In this two-hour special, renowned paleontologist Kirk Johnson takes us on an epic adventure through time at the polar extremes of our planet. Following a trail of strange fossils found in all the wrong places-beech trees in Antarctica, hippo-like mammals in the Arctic-Johnson uncovers the bizarre history of the poles, from miles-high ice sheets to warm polar forests teeming with life. What caused such dramatic changes at the ends of the Earth? And what can the past reveal about our planet's climate today-and in the future?

A look at dog domestication, how scientists test wolf intelligence and decode canine DNA, and what science says about a dog's love for humans.

A look at dog domestication, how scientists test wolf intelligence and decode canine DNA, and what science says about a dog's love for humans.

A look at dog domestication, how scientists test wolf intelligence and decode canine DNA, and what science says about a dog's love for humans.

The perplexing behaviors of cats have often raised the question of whether humans ever really domesticated felines.

The perplexing behaviors of cats have often raised the question of whether humans ever really domesticated felines.

The perplexing behaviors of cats have often raised the question of whether humans ever really domesticated felines.

Scientists study why animals and humans need to sleep, what happens to the brain during sleep, and the role sleep plays in memory, trauma, and emotion regulation.

Scientists study why animals and humans need to sleep, what happens to the brain during sleep, and the role sleep plays in memory, trauma, and emotion regulation.

Scientists study why animals and humans need to sleep, what happens to the brain during sleep, and the role sleep plays in memory, trauma, and emotion regulation.

When the trade embargo left Cuba isolated from medical resources, Cuba was forced to get creative. Now they've developed lung cancer vaccines that show promise, some Americans are defying the embargo and traveling to Cuba for treatment.

The mysteries of fat and its role in hormone production, hunger and pregnancy.

Doctors strategize to stop the spread of COVID-19; researchers work toward finding treatments and vaccines; how the disease emerged, what it does to the human body, and how it became a pandemic.

Up-close footage provides a look at the strength, eyesight and flying skills of an eagle, and reveals the danger and drama of chicks as they struggle to survive.

A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques. Written by Jean-Marc Rocher rocher@fiberbit.net

A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques. Written by Jean-Marc Rocher rocher@fiberbit.net

A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques. Written by Jean-Marc Rocher rocher@fiberbit.net

A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques. Written by Jean-Marc Rocher rocher@fiberbit.net

A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques. Written by Jean-Marc Rocher rocher@fiberbit.net

A weekly documentary series, each episode providing an in-depth look at a different subject of scientific research. Subjects examined by this show have included the cutting edge of theoretical physics, a return to the Chernobyl nuclear reactor, the long-term effects of Amazon deforestation, and the development of life-saving medical techniques. Written by Jean-Marc Rocher rocher@fiberbit.net