NOVA scienceNOW

#1 - Dark Matter, Of Mice and Memory

Season 3 - Episode 1

Dark Matter - Turns out most of the universe is held together by a mysterious, invisible substance. Of Mice and Memory - Mice placed in enriched environments can recover lost memories, giving hope to those who study Alzheimer's. Profile: Hany Farid - This self-proclaimed "accidental scientist" is a digital detective inventing new ways to tell if photos have been faked. Wisdom of the Crowds - Ask enough people to estimate something, and their combined guesses will get you surprisingly close to the right answer.

#2 - Leeches, The Search for ET, Stem Cells Breakthrough

Season 3 - Episode 5

Leeches - A century after falling out of favor, medicinal leeches are back in hospitals, sucking away on patients' wounds. SETI - Astronomers have their radio telescopes tuned to receive signals from alien worlds. But is anybody out there? Stem Cells Breakthrough - Three separate teams overcome a biomedical hurdle—creating stem cells without the use of human embryos. Profile: Edith Widder - Meet a marine biologist and explorer who has engineered new ways to spy on deep-sea creatures.

#3 - Diamond Factory, Anthrax Investigation, Auto-Tun

Season 4 - Episode 1

#4 - 1918 Flu, Mass Extinction, Papyrus

Season 2 - Episode 2

What caused the greatest mass extinction nearly 250 million years ago?1918 Flu: The 1918 flu virus is revived and decoded in the hopes that we can learn from it before the next pandemic.Profile: Cynthia Breazeal: A look at MIT social roboticist Cynthia Breazeal.Papyrus: Can we use space-age technology to read papyri fragments that are almost 2,000 years old?

#5 - Personal DNA Testing, Art Authentication, Capturing Carbon

Season 3 - Episode 2

Personal DNA Testing - Genetic testing to assess risk factors for a handful of serious illnesses is now commercially available. But is it a good idea? Art Authentication - See how clever computer algorithms can distinguish a master fake from a masterpiece. Capturing Carbon - An eighth-grader's science fair project prompts her scientist father to develop a new way to pull excess carbon dioxide out of the atmosphere. Profile: Pardis Sabeti - By night she's a rocker. By day, she's a Harvard geneticist tracking the evolution of the human genome.

#6 - Can We Live Forever?

Season 5 - Episode 2

This provocative episode of NOVA scienceNOW examines whether we can slow down the aging process, looks at the latest on human hibernation, and checks in with bioengineers and a computer scientist inventing ways to keep us "going forever." Neil deGrasse Tyson also takes a lighthearted look at whether the tricks that have kept a 1966 Volvo running for 2.7 million miles can also help the human body go the extra mile.

#7 - Can We Make It to Mars?

Season 5 - Episode 1

Can humans survive a trip to Mars and back that could take two to three years? This episode of NOVA scienceNOW examines all of the perils of this journey, including deadly meteoroids, bone and muscle deterioration, and cosmic radiation. Host Neil deGrasse Tyson checks in with scientists who are developing new ways to keep astronauts alive on such a journey. Among the innovations covered are meteoroid-proof materials, new space foods and spacesuits, and novel modes of transport, such as plasma rockets. This episode also profiles young female scientist and daredevil Vandi Verma, part of the team that drives the Mars rovers on the martian surface.

#8 - Sleep, CERN, Emergence

Season 2 - Episode 4

Sleep may play an important role in strengthening memories.CERN: The Large Hadron Collider (LHC) nears completion at the international particle physics lab in Geneva, Switzerland.Emergence: Scientists try to understand a phenomenon called emergence, which allows a flock of birds or a school of fish to maintain such impressive order.Profile: Julie Schablitsky: A profile of University of Oregon archaeologist Julie Schablitsky, whose research is helping to rewrite the history of the Old West.

#9 - What Makes Us Human?

Season 6 - Episode 1

Scientists have struggled for centuries to pinpoint the qualities that separate human beings from the millions of other animal species that have evolved on this planet. David Pogue explores the traits we once thought were uniquely ours—language, tool-making, even laughter—to uncover their evolutionary roots. He'll trace some of the crucial steps that transformed cave men to accountants, and find out if any of his own DNA came from a Neanderthal ancestor.

#10 - Fuel cells, RNAi, Fastest Glacier

Season 1 - Episode 3

Featured segments include: the future of hydrogen fuel cell cars, the discovery of medical potential within a petunia, a fast moving glacier and what it says about global warming, and a profile of brothers and mathematicians Gregory and David Chudnovsky.

#11 - How Smart Can We Get?

Season 6 - Episode 3

How do you get a genius brain? Is it all in your genes? Or is it hard work? Is it possible that everyone’s brain has untapped genius–just waiting for the right circumstances so it can be unleashed? From a man who can immediately name the day of the week of any date in history to a “memory athlete” who can remember strings of hundreds of random numbers, David Pogue meets people stretching the boundaries of what the human mind can do. Then, Pogue puts himself to the test: after high-resolution scanning, he finds out how the anatomy of his brain measures up against the greatest mind of the century: Albert Einstein.

#12 - How Does the Brain Work?

Season 5 - Episode 3

This episode of NOVA scienceNOW delves into some pretty heady stuff, examining magic and the brain, artificial intelligence, magnetic mind control, and the work of neuroscientist and synesthesia researcher David Eagleman. Can we really believe our own eyes? Will machines one day think like us? Can magnetic wands effectively control brain functions and treat depression? Explore this and more.

#13 - Saving Hubble, First Primates

Season 3 - Episode 3

Saving Hubble - Two teams of spacewalkers take on the risky mission of reviving the ailing Space Telescope. First Primates - Our most distant primate ancestors, which lived about 55 million years ago, were tree-dwellers the size of mice. Profile: Alfredo Quiñones-Hinojosa - He jumped the fence from Mexico to work as a farmhand and ended up a leading brain surgeon. Killer Microbe - A relatively benign bug becomes a highly lethal pathogen, known to U.S. soldiers as Iraqibacter.

#14 - Bird Brains, Space Storms

Season 3 - Episode 4

Bird Brains - Clues to the origins of human language are turning up in the brains of birds. Space Storms - Behind the dazzling display of the aurora borealis are space storms that could turn the lights off here on Earth. Profile: Yoky Matsuoka - A former tennis prodigy aims to create advanced prosthetic limbs controlled by human thought. Smart Bridges - Can we engineer bridges that tell us what's wrong with them before it's too late?

#15 - 10th Planet, Twin Prime Conjecture, Ivory-Billed Woodpecker, Pandemic Flu, Lab Meat?, Stem Cells

Season 1 - Episode 5

Featured segments include: a possible tenth planet in our solar system, the twin prime conjecture, a possible reappearance of the ivory-billed woodpecker, a look at the bird flu and whether it will move to people, the growing of meat in a laboratory culture, an update on stem cells, the link between hurricanes and global warming, and a profile of cancer researcher Tyler Curiel.

#16 - Where Did We Come From?

Season 5 - Episode 5

In this episode of NOVA scienceNOW, journey back in time to the birth of our solar system to examine whether the key to our planet's existence might have been the explosive shockwave of an ancient supernova. Meet a chemist who has yielded a new kind of "recipe" for natural processes to assemble and create the building blocks of life. And see how the head louse, a creepy critter that's been sucking our blood for millions of years, is offering clues about our evolution. Finally, meet neuroscientist André Fenton, who is looking into erasing painful memories with an injection.

#17 - How Smart Are Animals?

Season 5 - Episode 4

Would you care to match wits with a dog, an octopus, a dolphin, or a parrot? You may think twice after watching the segments in this NOVA scienceNOW episode. While we may not be ready to send pets to Harvard, the remarkable footage and findings presented here demonstrate that many animal species are much smarter than we assume and in ways we had never imagined.

#18 - Picky Eaters, Capturing Carbon, Sea Lions and Walruses

Season 4 - Episode 4

Discover why picky eaters may have a genetic excuse, learn about a new strategy for capturing carbon dioxide from the atmosphere, see just how intelligent marine mammals can be, and meet a biomedical engineer who has figured out a way to make tiny livers in her lab.

#19 - What's the Next Big Thing?

Season 5 - Episode 6

In this episode of NOVA scienceNOW, come face to face with social robots that understand human feelings, carry on conversations, even make jokes. Then travel to Haiti, where geologists investigate the 2010 earthquake not long after it struck for clues to how to better forecast future quakes. Afterwards, join engineers at General Motors who are testing tiny, two-wheeled cars called EN-Vs, which one day might drive themselves through city streets. Learn about proposals for making our outdated electric grid "smart." And meet Nebraska native Jay Keasling, a pioneer in synthetic biology who shares his work on developing "designer" microbes that produce biofuels and medicines.

#20 - Phoenix Mars Lander, Brain Trauma, Mammoth Mystery

Season 3 - Episode 6

Phoenix Mars Lander - NASA's latest robot has already found frozen water and is looking for more signs that the Red Planet could support life. Brain Trauma - Even so-called "mild" head injuries turn out to be anything but. Mammoth Mystery - A pair of mammoth skeletons is found locked together by their tusks. What happened? Profile: Judah Folkman - Once scorned for his ideas about how cancer grows, the late Judah Folkman is now hailed as a visionary.

#21 - What Are Animals Thinking?

Season 6 - Episode 5

We humans have long wondered how animals see the world—and us. Does your dog really feel shame when it gives you that famous "guilty look?" What is behind the "swarm intelligence" of slime mold or a honeybee hive? How can pigeons possibly find their way home across hundreds of miles of unfamiliar terrain? In this episode of NOVA scienceNOW, David Pogue meets—and competes—with a menagerie of smart critters that challenge preconceived notions about what makes "us" different from "them," expanding our understanding of how animals really think.

#22 - Moon Smasher, Secrets in the Salt, Bird Brains

Season 4 - Episode 5

Follow a NASA satellite looking for water on the moon, see what ancient salt deposits reveal about life 250 million years ago, learn how bird brains are remarkably similar to our own, and meet a climatologist who digs for clues to climate change in the world's highest glaciers.

#23 - Little People of Flores, T. rex

Season 1 - Episode 2

Featured segments include: the discovered remains of three-foot-tall humans on the island of Flores, a look at how T. Rex got to be so big, a profile of nanotechnologist Naomi Halas, the issues surrounding stem cells, and the yearly freeze and thaw cycle of the common wood frog.