Extreme Cave Diving
Airs week of Feb. 8

Earth's climate history is explored via underwater caves.

Extreme Ice
Airs week of Feb. 15

An acclaimed photographer teams up with scientists to document the runaway melting of arctic glaciers.

Last Extinction: Megabeasts' Sudden Death
Airs week of Feb. 22

Scientists propose a radical new idea of what killed off mammoths and other large animals at the end of the Ice Age.

The Pluto Files
Airs week of March 1

Take a cross-cuntry journey wih Neil deGrasse Tyson to explore the rise and fall of America's favorite planet.

Un-Titled

A Walk to Beautiful

Ethiopian women with obstetric fistula.

Alien From Earth

The 2003 discovery of the remains of a hobbit-sized people.

Ape Genius

The intellectual abilities of the great apes.

Arctic Dinosaurs

An excavation in Alaska sheds light on dinosaurs.

AstroSpies

A look at plans to militarize space by the U.S. and USSR.

Becoming Human: Birth of Humanity

Part 2 of 3. "Turkana Boy," a Homo erectus specimen.

Becoming Human: First Steps

Part 1 of 3. The evolutionary arc of humans is explored.

Becoming Human: Last Human Standing

Conclusion. The roots of Homo sapiens.

Bone Diggers

Remains of a marsupial lion and a giant kangaroo are found.

Building on Ground Zero

"Building on Ground Zero" recalls 9/11.

Car of the Future

Tom and Ray Magliozzi ("Car Talk") search for a new car.

Cracking the Maya Code

An examination of the hieroglyphs used by the Maya.

Darwin's Darkest Hour

The dilemma Charles Darwin (Henry Ian Cusick) faced.

Doctors' Diaries

Conclusion. The stories of seven medical students.

Extreme Ice

The apparent acceleration in the melting of glaciers.

Family That Walks on All Fours

Five siblings in a Turkish family who walk on all fours.

First Flower

The history of the flower is explored.

Forgotten Genius

Groundbreaking black chemist Percy Julian (1899-1975).

Hubble's Amazing Rescue

The May 2009 mission to repair the Hubble Space Telescope.

Is There Life on Mars?

An in-depth look at NASA's Mars missions.

Killer Subs in Pearl Harbor

The sinking of the USS Arizona during Pearl Harbor.

Killer Subs in Pearl Harbor
Airs Week of Jan. 4

Surprising new evidence of an underwater submarine attack at Pearl Harbor.

Lord of the Ants

A profile of biologist E.O. Wilson.

Monster of the Milky Way

An examination of black holes, what they are.

Musical Minds

Music's affect on the brain is explored.

Mystery of the Megavolcano

Topic: a "supervolcano" that erupted some 74,000 years ago.

Ocean Animal Emergency

The work of Marine Mammal Center veterinarians is explored.

Parallel Worlds, Parallel Lives

A profile of quantum physicist Hugh Everett III (1930-82).

Riddles of the Sphinx

The origins of the Great Sphinx of Giza.

Saved by the Sun

The promise of solar energy is examined.

Secrets of the Samurai Sword

The science behind samurai swords is explored.

Space Shuttle Disaster

The 2003 space-shuttle Columbia tragedy is explored.

Sputnik Declassified

The early years of the space race are recalled.

The Bible's Buried Secrets

A fascinating exploration of early Judaism.

The Ghost in Your Genes

An examination of the epigenome.

The Last Great Ape

The bonobo (aka pygmy chimpanzee) is examined.

The Spy Factory

An examination of the National Security Agency.

Underwater Dream Machine

The story of an engineer who built his own submarine.

Volcano Above the Clouds

Chronicling an ascent of Tanzania's Mount Kilimanjaro.

What Are Dreams?

Possible purposes of dreams are explored.

What Darwin Never Knew

The science of evolutionary development.