
Experts in Alaska investigate how dinosaurs managed to thrive in polar regions.

An investigation uncovers the human failures and design flaws behind the 2003 Columbia tragedy.

Join Mark Everett on his quixotic quest to understand his father Hugh, creator of a radical theory of quantum physics.

Mysteriously beautiful fractals are shaking up the world of mathematics and deepening our understanding of nature.

Do the remains of a tiny hobbit-like creature found on the island of Flores belong to a new human species?

An archeological detective story traces the origins of the Hebrew Bible

Wildlife veterinarians struggle to save injured seals and sea lions on the California coast.

The decades-long search for life on the Red Planet heats up with the discovery of frozen water.

Can California's ambitious plan to cut greenhouse gases actually succeed?

Follow the extraordinary 2,000-mile migration of monarch butterflies to a sanctuary in the highlands of Mexico.

Examine the high-tech eavesdropping carried out by the National Security Agency and the pitfalls of surveillance in an age of terrorism.

Why do huge swarms of rats overrun a bamboo forest in India once every half-century?

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

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

Seven doctors, 21 years... Saving lives is only part of the story. Part 1 of 2.

Seven doctors, 21 years... Saving lives is only part of the story. Part 2 of 2.

Oliver Sacks explores how the power of music can make the brain come alive.