Nova investigates the impact of forces that are radically changing populations in both rich and poor nations.

NOVA recreates the expeditions of Sir John Franklin and Roald Amundsen, two Arctic explorers who set out to find the legendary Arctic sea route known as the Northwest Passage.

Most people imagine dinosaurs lurking in warm locales with swamps and jungles, dining on vegetation and each other. But "Arctic Dinosaurs" reveals that many species also thrived in the harsh environments of the north and south polar regions. NOVA follows two high-stakes expeditions and the paleontologists who push the limits of science to unearth 70 million-year-old fossils buried in the vast Alaskan tundra.

What is the strongest material in the world? Is it steel, Kevlar, carbon nanotubes, or something entirely new? NOVA kicks off the four-part series "Making Stuff" with a quest for the world's strongest substances. Host David Pogue takes a look at what defines strength, examining everything from steel cables to mollusks to a toucan's beak. Pogue travels from the deck of a U.S. naval aircraft carrier to a demolition derby to the country's top research labs to check in with experts who are re-engineering what nature has given us to create the next generation of strong stuff.

How small can we go? Could we one day have robots taking "fantastic voyages" in our bodies to kill rogue cells? The triumphs of tiny are seen all around us in the Information Age: transistors, microchips, laptops, cell phones. Now, David Pogue takes NOVA viewers to an even smaller world in "Making Stuff: Smaller," examining the latest in high-powered nano-circuits and micro-robots that may one day hold the key to saving lives.

NOVA examines the science and technology behind cyber warfare and asks if we are already in the midst of a deadly new arms race.