Professor Stephen Hawking shows how we discovered that most of the matter in the Universe is missing and looks at the possible existence of dark matter.

portraits of the world's wildest places, seen through the eyes of the earliest explorers

This episode looks at death and follows Herbie on his final journey as he slowly succumbs to cancer.

Leading scientists give an account of the ideas that have shaped our world

A two-part special exploring the possibility of life on Mars (S)

A look at the evidence for and against the existence of sophisticated thought in animals

Professor Stephen Hawking shows how we discovered that most of the matter in the Universe is missing and looks at the possible existence of dark matter.

portraits of the world's wildest places, seen through the eyes of the earliest explorers

This episode looks at death and follows Herbie on his final journey as he slowly succumbs to cancer.

Leading scientists give an account of the ideas that have shaped our world

A two-part special exploring the possibility of life on Mars (S)

A look at the evidence for and against the existence of sophisticated thought in animals

Professor Stephen Hawking shows how we discovered that most of the matter in the Universe is missing and looks at the possible existence of dark matter.

portraits of the world's wildest places, seen through the eyes of the earliest explorers

This episode looks at death and follows Herbie on his final journey as he slowly succumbs to cancer.

Leading scientists give an account of the ideas that have shaped our world

A two-part special exploring the possibility of life on Mars (S)

A look at the evidence for and against the existence of sophisticated thought in animals

Professor Stephen Hawking shows how we discovered that most of the matter in the Universe is missing and looks at the possible existence of dark matter.

portraits of the world's wildest places, seen through the eyes of the earliest explorers

This episode looks at death and follows Herbie on his final journey as he slowly succumbs to cancer.

Leading scientists give an account of the ideas that have shaped our world

A two-part special exploring the possibility of life on Mars (S)

A look at the evidence for and against the existence of sophisticated thought in animals

Professor Stephen Hawking shows how we discovered that most of the matter in the Universe is missing and looks at the possible existence of dark matter.

portraits of the world's wildest places, seen through the eyes of the earliest explorers

This episode looks at death and follows Herbie on his final journey as he slowly succumbs to cancer.

Leading scientists give an account of the ideas that have shaped our world

A two-part special exploring the possibility of life on Mars (S)

A look at the evidence for and against the existence of sophisticated thought in animals

Professor Stephen Hawking shows how we discovered that most of the matter in the Universe is missing and looks at the possible existence of dark matter.

portraits of the world's wildest places, seen through the eyes of the earliest explorers

This episode looks at death and follows Herbie on his final journey as he slowly succumbs to cancer.

Leading scientists give an account of the ideas that have shaped our world

A two-part special exploring the possibility of life on Mars (S)

A look at the evidence for and against the existence of sophisticated thought in animals