Nova

1Ancient Creatures of the Deep

6This Old Pyramid

4Secrets of Making Money

13Secrets of Lost Empires: Stonehenge (1)

14Secrets of Lost Empires: Inca (2)

15Secrets of Lost Empires: Obelisk (3)

16Secrets of Lost Empires: Colosseum (4)

7Treasures of the Sunken City

3The Elegant Universe

2Neanderthals on Trial

4The Elegant Universe: String's the Thing (2)

7Magnetic Storm

10Secrets of the Cocrodile Caves

13Crash of Flight 111

1Origins: Earth Is Born

5The Most Dangerous Woman in America

8Ancient Refuge in the Holy Land

9Welcome to Mars

11Supersonic Dream

13Saving the National Treasures

15Wave That Shook the World

1Mystery of the Megaflood

2Sinking the Supership

4Volcano Under the City

8The Mummy Who Would Be King

9Deadly Ascent

10The Perfect Corpse

12The Ghost Particle

14The Great Robot Race

16Dimming the Sun

1Building on Ground Zero

4Monster of the Milky Way

5Wings of Madness

9The Last Great Ape

10Kings of Camouflage

11First Flower

12Saved by the Sun

13Pocahontas Revealed

14Bone Diggers

15The Great Inca Rebellion

1Secrets of the Samurai Sword

5Judgment Day: Intelligent Design on Trial

When the school board in Dover, Pennsylvania votes to require science teachers to read a statement touting Intelligent Design as a scientific alternative to Darwin's Theory of Evolution parents sue the district, leading to a trial in which the judge must decide if Intelligent Design is merely a new name for creationism, already banned in public schools as being religious in nature.

13The Four-Winged Dinosaur

1Arctic Dinosaurs

Dinosaurs are generally considered tropical animals. So what are their fossils doing north of the arctic circle? Paleontologists battle the fierce climate to find out if the arctic was warmer then than it is now, or the arctic was farther from the North Pole, or the dinosaurs were migratory animals, or if they warm blooded.

3Parallel Worlds, Parallel Lives

13Extreme Ice

3Lizard Kings

13Extreme Cave Diving

19Mind Over Money

2Emergency Mine Rescue

4Dogs Decoded

7Secrets Beneath the Ice

10Making Stuff: Smaller

11Making Stuff: Cleaner

12Making Stuff: Smarter

13Smartest Machine on Earth

14Crash of Flight 447

15Venom: Nature's Killer

1Secrets of the Viking Sword

2Forensics on Trial

3Mystery of Easter Island

Easter Island has mystified the world ever since the first Europeans arrived in 1722. |

8Rise of the Drones

9Who Killed Lindbergh's Baby?

10Building Pharaoh's Chariot

11Earth from Space

12Mind of a Rampage Killer

13Russian Meteor Strike

14Ancient Computer

The arms and faces of ancient statuary litter the seabed at the site of a shipwreck off the coast of Greece. But that's not the most interesting find. Encrusted with over 2,000 years of mineral deposits are highly engineered gears clearly visible as part of a mysterious device dating back to about 50 BCE. Using X-ray technology and working off of the realization that the gears' teeth are prime numbers relating to astronomy, the device is revealed to be the earliest known computer used for predicting eclipses and demonstrating planetary motion. Written by

15Australia's First 4 Billion Years: Awakening

16Australia's First 4 Billion Years: Life Explodes

17Australia's First 4 Billion Years: Monsters

18Australia's First 4 Billion Years: Strange Creatures

19Manhunt: Boston Bombers

20Oklahoma's Deadliest Tornadoes

1Ground Zero Supertower

2Megastorm Aftermath

3Making Stuff Faster

4Making Stuff Wilder

From PBS and NOVA: What happens when engineers open up nature's toolbox? David Pogue explores bold innovations inspired by the Earth's greatest inventor, life itself. From underwater wi-fi based on dolphin communication, to robotic "mules" and "cheetahs" for the military, to swarms of robotic bees, Pogue travels the world seeing the "wildest" ideas put into action in new inventions and technologies. It is a journey that sees today's bacteria turned into tomorrow's metallurgists, viruses building batteries, and even DNA, the Code of Life, put to work in "living" computers. Will the stuff of the future take on a life of its own?

5Making Stuff Colder

6Making Stuff Safer

From PBS and NOVA: Is it possible to engineer an absolutely safe world for ourselves? Host David Pogue explores the extent to which science and technology can protect us from monumental forces of nature such as earthquakes and epidemics. He challenges researchers to save us from dangers of our own making, such as traffic accidents and contact sports. Our increasing reliance on the internet makes us vulnerable to new risks: Pogue delves into cyber security, where computer experts work to shield us from attacks from hackers and terrorists. Risk is all around us -- but we can be smart about it.

7Cold Case JFK

From PBS and NOVA: Cold Case JFK. For decades, the assassination of John F. Kennedy has fueled dark rumors of conspiracies and mishandled evidence. Now, fifty years later, NOVA asks: Could modern investigators do better? We'll see how state-of-the art forensic tools would be applied to the investigation were it to happen today. At the same time, NOVA takes a critical look at contemporary cases, like the murders of Nicole Brown Simpson and Ronald Goldman, to reveal how charges of evidence mishandling and human error can mar even scientifically sophisticated detective work. Will forensics ever be truly foolproof, or does modern technology just give a scientific sheen to a practice that will always be more art than science?

8At the Edge of Space

Between the blue sky above and the infinite blackness beyond lies a frontier that scientists have only just begun to investigate. In "At the Edge of Space," NOVA takes viewers on a spectacular exploration of the Earth-space boundary that's home to some of nature's most puzzling and alluring phenomena: the shimmering aurora, streaking meteors, and fleeting flashes that shoot upwards from thunderclouds, known as sprites.

9Asteroid: Doomsday of Payday?

The asteroid that exploded over Siberia--injuring more than 1,000 and damaging buildings in six cities--was a shocking reminder that Earth is a target in a cosmic shooting range. From the width of a football field to the size of a small city, these space rocks have the potential to be killers. In a collision with Earth, they could set off deadly blast waves, raging fires and colossal tidal waves.

10Alien Planets Revealed

From PBS - It's a golden age for planet hunters: recently, they've discovered more than 750 planets orbiting stars beyond our sun. Some of them, like a planet called Kepler-22b, might even be able to harbor life. What would that life look like? Combining startling animation with input from expert astrobiologists, Alien Planets Revealed takes viewers on a journey of the imagination as we "build" aliens from the ground up.

11Zeppelin Terror Attack

From PBS - In the early days of World War I, Germany, determined to bring its British enemies to their knees, launched a new kind of terror campaign: bombing civilians from the sky. But the aircraft delivering the lethal payloads weren't planes. They were Zeppelins, enormous airships, some the length of two football fields. With a team of engineers, explosives experts, and historians, NOVA investigates the secrets behind these deadly war machines. Zeppelin Terror Attack explores the technological arms race that unfolded as Britain desperately scrambled to develop defenses that could neutralize the threat, while Germany responded with ever bigger and more powerful Zeppelins. Why were these German monsters of the sky, filled with highly flammable hydrogen gas, so difficult to shoot down? How were their massive gas bags pieced together from the intestines of millions of cows? Experts reconstruct and detonate deadly WWI incendiary bombs and test fire antique flaming bullets, all to discover how the British came up with the unique artillery that would finally take down the biggest flying machines ever made.

12Killer Typhoon

From PBS - It was the strongest cyclone to hit land in recorded history. On November 8, 2013, Typhoon Haiyan -- what some are calling "the perfect storm" -- slammed into the Philippines, whipping the low-lying and densely-populated islands with 200 mile-per-hour winds and sending a two-story-high storm surge flooding into homes, schools, and hospitals. It wiped villages off the map and devastated cities, including the hard-hit provincial capital Tacloban. Estimates count more than 5,000 dead and millions homeless. What made Haiyan so destructive? In-depth interviews with the meteorologists charged with tracking and forecasting Pacific storms take us inside the anatomy of the typhoon, tracking its progress from its start as a low-pressure area over Micronesia to its deadly landfall and revealing why the Pacific is such fertile ground for cyclones. But that's just part of the story of why this storm was so deadly.

13Ghosts of Murdered Kings

From PBS - A corpse found in a bog in the hills of Ireland's County Tipperary dates to the Bronze Age, more than 3,000 years ago. A CAT scan reveals a violent demise: the body covered in axe marks, the spine snapped and the arm broken in two places. NOVA follows archaeologists and forensic experts in their hunt for clues to the identity and the circumstances of this and other violent deaths of victims unearthed in bogs. A new theory suggests that they were ritually murdered kings, slain to assure the fertility of land and people.

14Roman Catacomb Mystery

From PBS - Beneath the streets of Rome lies an ancient city of the dead known as the catacombs, a labyrinth of tunnels, hundreds of miles long, a cemetery for the citizens of ancient Rome. In 2002, maintenance workers stumbled through an opening in one of the tunnel walls and discovered a previously unknown complex of six small rooms, each stacked floor to ceiling with skeletons. It was a mass grave, locked away for nearly 2,000 years. Who were these people? Why were so many interred in one place, piled atop each other? And most important, what killed them? NOVA's forensic investigation opens up new insights into the daily life and health of Roman citizens during the heyday of the mighty Roman Empire

15Great Cathedral Mystery

From PBS - The dome that crowns Florence's great cathedral of Santa Maria del Fiore -- the Duomo -- is a masterpiece of Renaissance ingenuity and an enduring source of mystery. Still the largest masonry dome on earth, it is taller than the Statue of Liberty and weighs as much as an average cruise ship. Historians and engineers have long debated how its architect, Filippo Brunelleschi, kept the dome perfectly aligned and symmetrical as the sides rose and converged toward the center. More than four million bricks could collapse at any moment -- and we still don't understand how Brunelleschi prevented it. To test the latest theories, a team of U.S. bricklayers will help build an experimental "mini-Duomo" using period tools and techniques.

16Wild Predator Invasion

17Inside Animal Minds: Bird Genius

18Inside Animal Minds: Dogs & Super Senses

19Inside Animal Minds: Who's the Smartest?

20Why Sharks Attack

21Escape from Nazi Alcatraz

From PBS - Colditz Castle, a notorious prisoner of war camp in Nazi Germany, was supposed to be escape-proof. But in the dark days at the end of World War II, a group of British officers dreamt up the ultimate escape plan: in a secret attic workshop, they constructed a two-man glider out of bed sheets and floorboards. Their plan was to fly to freedom from the roof of the castle, but the war ended before they could put it to the test. Now a crack team of aero engineers and carpenters rebuild the glider in the same attic using the same materials, and they'll do something the prisoners never got a chance to try: use a bathtub full of concrete to catapult the glider off the roof of the castle. As the hair-raising launch ninety feet up draws near, the program explores the Colditz legend and exposes the secrets of other ingenious and audacious escapes. Then, after a 70-year wait, the team finally finds out if the legendary glider plan would have succeeded.

22Episode #41.22

1Vaccines - Calling the Shots

From PBS and NOVA - Diseases that were largely eradicated in the United States a generation ago--including whooping cough, measles, mumps--are returning, in part because nervous parents are skipping their children's shots. Vaccines - Calling the Shots, a new NOVA special, takes viewers around the world to track epidemics, explore the science behind vaccinations, and shed light on the risks of opting out. The vast majority of Americans vaccinate their children, and most do it on the recommended schedule. Yet many people have questions about the safety of vaccines, and in some communities, vaccination rates have fallen below the level needed to maintain "herd immunity" --allowing outbreaks to take hold and spread. This film draws on the latest, best available evidence to help parents find the answers. Highlighting real cases and placing them in historical context, Vaccines--Calling the Shots traces outbreaks of communicable diseases and demonstrates just how fast they can spread--and ...

2Rise of the Hackers

From PBS and NOVA - Our lives are going digital. We shop, bank and even date online. Computers hold our treasured photographs, private emails, and all of our personal information. This data is precious -- and cybercriminals want it. Now, NOVA goes behind the scenes of the fast-paced world of cryptography to meet the scientists battling to keep our data safe. They are experts in extreme physics, math and a new field called "ultra-paranoid computing," all working to forge unbreakable codes and build ultra-fast computers. From the two men who uncovered the world's most advanced cyber weapon to the computer expert who worked out how to hack into cash machines and scientists who believe they can store a password in your unconscious brain, NOVA investigates how a new global geek squad is harnessing cutting-edge science -- all to stay one step ahead of the hackers.

3Why Planes Vanish

4Ben Franklin's Balloons

5First Air War

6Episode #42.6

8Emperor's Ghost Army

9Killer Landslides

Just before 11 a.m. on March 22, 2014, an ominous rumble startled the residents of the community of Oso...

10First Man on the Moon

A look inside the life of Neill Armstrong, the first man on the moon.

11Big Bang Machine

On July 4, 2012, scientists at the giant atom smashing facility at CERN announced the discovery of a...

12Sunken Ship Rescue

NOVA follows the epic operation to secure, raise and salvage the Costa Concordia cruise ship, which...

13Sinkholes-Buried Alive

In Tampa, Florida, in February 2013, a giant hole opened up under the bedroom floor of Jeffrey Bush...

14Episode #42.14

15Petra: Lost City of Stone

16Hagia Sophia: Istanbul's Mystery

17The Great Math Mystery

18Invisible Universe Revealed

Twenty-five years ago, NASA launched one of the most ambitious experiments in the history of astronomy: the Hubble Space Telescope...

19Episode #42.19

20Lethal Seas

21Chasing Pluto

22Nuclear Meltdown Disaster

1Dawn of Humanity

NOVA and National Geographic present exclusive access to an astounding discovery of ancient fossil human ancestors...

2Arctic Ghost Ship

3Secrets of Noah's Ark

4Cyberwar Threat

Cyber weapons have the ability to inflict physical damage on factories, power plants and pipelines. |

5Animal Mummies

Animal mummies from the Egyptian catacombs are examined. Also discussed, the role of animals in Egyptian beliefs. |

7Making North America: Origins

The shaping of North America, including palm trees that once thrived in Alaska and an eruption that nearly tore the Midwest in two. |

8Making North America: Life

9Making North America: Human

The influence of geology on the human occupation of North America is described. |

10Inside Einstein's Mind

Retrace the thought experiments that inspired his theory on the nature of reality.

11Life's Rocky Start

Four and a half billion years ago, the young Earth was a hellish place-a seething chaos of meteorite impacts...

12Mystery Beneath the Ice

13Himalayan Megaquake

14Creatures of Light

Examination of oceanic creatures that light up, whether to scare predators, lure prey or attract mates. And efforts to harness nature's light to track cancer cells, detect pollution, illuminate cities and map the inner workings of the brain are also examined.

15Memory Hackers

16Iceman Reborn

Murdered more than 5,000 years ago, Otzi the Iceman is the oldest human mummy on Earth. Now, newly discovered evidence sheds light not only on this mysterious ancient man, but on the dawn of civilization in Europe. |

17Rise of the Robots

18Vikings Unearthed

They were pioneering warriors, expert seafarers, and colonists of the North Atlantic realm. The Vikings...

19Can Alzheimer's Be Stopped?

20Wild Ways

From Yellowstone to the Yukon, to Southern Africa's elephant highways stretching across five nations...

21Operation Lighthouse Rescue

Engineers work to save historic Gay Head Lighthouse on Martha's Vineyard, which is falling victim to the ocean's erosion of the island's cliffs. |

22Bombing Hitler's Supergun

Historians and engineers investigate how Allied forces conspired to destroy Hitler's "supergun". |

115 Years of Terror

2School of the Future

3Great Human Odyssey

Numbering no more than a few thousand, tiny groups of intrepid humans began to move out of Africa-eventually dominating the planet...

4Super Tunnel

Follow an army of engineers and designers as they tackle the complex challenge of building Crossrail, a massive new subterranean railway deep beneath the streets of London. |

5Treasures of the Earth: Gems

6Treasures of the Earth: Metals

Metals are crucial to the technologies that are the foundations of our civilization. These are the stories of the metals and alloys that most transformed our live styles: gold, copper, bronze, iron, steel and aluminum with a bit of speculation about the materials that may transform the future.

7Treasures of the Earth: Power

Drill down to discover the treasures beneath our feet that power our world. Fossil fuels-coal, oil,...

8Secrets of the Sky Tombs

The towering Himalayas were among the last places on Earth that humanity settled. Scaling sheer cliff sides...

9The Nuclear Option

Five years after the earthquake and tsunami that triggered the unprecedented trio of meltdowns at the Fukushima Daiichi nuclear power plant...

10Search for the Super Battery

We live in an age when technological innovation seems to be limitlessly soaring. But for all the satisfying speed with which our gadgets have improved...

11Ultimate Cruise Ship

Weighing 54,000 gross tons and stretching over two football fields, the Seven Seas Explorer is no ordinary boat...

12The Origami Revolution

13Why Trains Crash

14Holocaust Escape Tunnel #44.14

16Chinese Chariots Revealed

17Poisoned Water

In this special report, NOVA investigates the water disaster in Flint and unravels a disturbing truth...

18Eclipse Over America #45.1

19Death Dive to Saturn

20Secrets of the Shining Knight

Discover what it was like to be a knight in shining armor and follow the historic manufacturing process. Master armorers re-engineer the Greenwich armor - considered some of the greatest armor ever made - and then put it to the test. |

21Ghosts of Stonehenge #45.4

22Secrets of the Forbidden City #45.5

23Killer Volcanoes

Volcanologists search for an elusive volcanic mega-eruption that plunged the medieval earth into a deep freeze. Investigate the geologic evidence from Greenland all the way to Antarctica to identify the 750-year-old culprit. |

24Killer Hurricanes

25Killer Floods

Geologists examine extreme terrain on Iceland, the Scablands in Washington State, and submerged in the English channel to see if they were created by the same process, a sudden titanic flood. |

26Extreme Animal Weapons

27Bird Brain

28Day the Dinosaurs Died

1Black Hole Apocalypse

A Two part documentary sharing detailed information on Black holes.

2The Impossible Flight

Two pilots fly a solar-powered airplane around the world.

3First Face of America

One unlucky day 13,000 years ago, a slight, malnourished teenager missed her footing and tumbled to the bottom of a 100-foot pit deep inside a cave in Mexico's Yucatán. Rising seas flooded the cave and cut it off from the outside world-until a team of divers chanced upon her nearly complete skeleton in 2007. Intricate detective work reveals that the young woman's bones are among the earliest known human remains in the Americas. What drove her to venture nearly a mile underground inside a vast cave? Where did her people come from, and why does she look so distinct from today's Native Americans? From a stunning Mexico cave to the wilderness of the Yukon, from the genetics lab to the forefront of forensics, NOVA pursues tantalizing new clues that are rewriting the story of the forgotten first people who ventured into our continent.

4Great Escape at Dunkirk

Archaeologists and divers recover remains of ships and planes that were lost in Dunkirk, France during World War II.

5Prediction by the Numbers

A look at why some predictions fail while others succeed at forecasting the future.

6Decoding the Weather Machine

Scientists around the world strive for a better understanding of the workings of the weather and climate machine known as Earth.

7Rise of the Superstorms

In summer 2017, three monster hurricanes swept in from the Atlantic one after another, shattering storm records and killing hundreds of people. Dive into the devastation wrought by Hurricanes Harvey, Irma, and Maria. How can scientists better predict these storms, and what does the 2017 season tell us about the likelihood of similar storms in the future?

8Transplanting Hope

9Operation Bridge Rescue

Follow the race to rebuild the Old Blenheim Bridge in New York State, an icon of 19th century American engineering, destroyed by Hurricane Irene in 2011. Watch a team of elite craftsmen faithfully reproduce the massive, intricate wooden structure under grueling time pressure as flooding threatens their worksite. In China, witness craftsmen restoring thousand-year-old covered bridges based on ingenious frameworks of woven timber beams. Discover how Chinese artisans are keeping traditional skills alive to ensure the survival of these stunning ancient structures.

10Volcano on Fire

Climb with volcano experts to the summit of Nyiragongo, a highly active volcano in the Democratic Republic of the Congo. Twice in recent memory it has erupted, devastating Goma, a neighboring city of 1 million people. To investigate when it might erupt next, scientists climb into its crater toward a bubbling lava lake to deploy sensors and monitor the volcano's activity.

11Volcano on the Brink

Explore Nyamuragira, one of the world's most active and mysterious volcanoes in Africa. Decades of civil strife have prevented scientists from investigating the volcano, but a brief pause allows an international team of experts to fly by helicopter to the summit to investigate.

12Addiction

Discover how opioid addiction affects the brain and how evidence-based treatments are saving lives.

13Flying Supersonic

Archival and 3-D imagery of the supersonic aircraft and its structure reveal how the dream of building the airliner became reality.

14The Last B-24

Underwater archaeologists and technical divers excavate the wreckage of the B-24 Liberator bomber Tulsamerican in hopes of finding out what happened to the three airmen who went missing when the plane crashed off the coast of Croatia in 1944.

15Thai Cave Rescue

Rescue workers race against the clock to save twelve boys and their soccer coach trapped in a cave system in Thailand.

16World's Fastest Animal

The peregrine falcon reaches high speeds to become the world's fastest animal; bird trainer Lloyd Buck attempts to get his peregrine, Moses, to go faster.

17Apollo's Daring Mission

Astronauts and engineers of Apollo 8 explain the inside story of the first mission to circumnavigate the moon.

1Beyond Pluto #46.1

2Einsteins Quantum Riddle #46.2

3Kilauea: Hawai'i on Fire

An investigation into the increased activity at the Kilauea volcano in Hawaii, and look at why these geologically distinctive volcanoes formed in the middle of the Pacific.

4Decoding the Great Pyramid

Archaeological research by Mark Lehner and Zahi Hawass shed light on some of the mysteries of the Egyptian pyramids.

5Rise of the Rockets

6The Next Pompeii #46.6

7Saving the Dead Sea #46.7

8Inside the Megafire #46.8

9First Horse Warriors #46.9

10Lost Viking Army #46.10

12Back to the Moon

Fifty years after humans first stepped foot on the moon, engineers, scientists and entrepreneurs engage in new discoveries to make life on the moon a reality.

13Inner Worlds

The rocky planets have similar origins, but only one supports life. Was it always this way?

14The Planets: Jupiter

Jupiter's gravitational force made it a wrecking ball as it barreled through the early solar system, but it also helped shape life on Earth as it brought comets laden with water and possibly the asteroid that put an end to the dinosaurs.

15The Planets: Saturn

NASA's Cassini probe explores Saturn's icy rings and moons, capturing ring-moon interactions and revealing ingredients for life on the moon Enceladus.

16The Planets: Ice Worlds

Uranus and Neptune's unexpected rings, supersonic winds and dozens of moons; an up-close view of Pluto before exploring the Kuiper belt

19Rise of the Mammals

A new trove of fossils reveals how mammals took over after an asteroid wiped out the dinosaurs 66 million years ago.

22The Violence Paradox

A journey through history and the human mind to explore violence, and how a more peaceful world can be achieved.

23Animal Espionage

Camera traps and drones offer an up-close look at animals without disturbing them, providing insight into the secret world of animals such as whales, tigers, and giant armadillos.

1Polar Extremes

Paleontologist Kirk Johnson explores the polar extremes of the planet, including miles-high ice sheets and warm polar forests brimming with life.

2Dog Tales

A look at dog domestication, how scientists test wolf intelligence and decode canine DNA, and what science says about a dog's love for humans.

3Cat Tales

The perplexing behaviors of cats have often raised the question of whether humans ever really domesticated felines.

4Mysteries of Sleep

Scientists study why animals and humans need to sleep, what happens to the brain during sleep, and the role sleep plays in memory, trauma, and emotion regulation.

5Cuba's Cancer Hope

When the trade embargo left Cuba isolated from medical resources, Cuba was forced to get creative. Now they've developed lung cancer vaccines that show promise, some Americans are defying the embargo and traveling to Cuba for treatment.

6The Truth About Fat

The mysteries of fat and its role in hormone production, hunger and pregnancy.

7Decoding COVID-19

Doctors strategize to stop the spread of COVID-19; researchers work toward finding treatments and vaccines; how the disease emerged, what it does to the human body, and how it became a pandemic.

8Eagle Power

Up-close footage provides a look at the strength, eyesight and flying skills of an eagle, and reveals the danger and drama of chicks as they struggle to survive.

9Human Nature

Scientists study the implications of CRISPR (Clustered Regularly Inter-spaced Short Palindromic Repeats: a family of DNA sequences found in the genomes of organisms such as bacteria) and how they may change the human race's relationship with nature and what it means for human evolution.

10The Secret Mind of Slime

New research on extremely primitive life forms called slime molds, which navigate through life without a brain, could reveal the fundamental rules underlying all decision making.

11A to Z: The First Alphabet

Researchers uncover the evolution of writing and the story of the alphabet, dating back to millennia, old carvings in an Egyptian turquoise mine.

12A to Z: How Writing Changed the World

How the development of writing played a vital role in shaping world history, from the invention of paper to the printed book.

13Nature's Fear Factor

Scientists reintroduce wild dogs to Mozambique's Gorongosa National Park to see if it helps restore balance to the entire ecosystem.

14Touching the Asteroid

Spacecraft OSIRIS-REx attempts to grab a piece of an asteroid to bring back to Earth so scientists can study it to learn about the planet's origins.

15Can We Cool the Planet?

As global temperatures rise, scientists look to geoengineering solutions, from planting trees to sucking carbon out of the air, as a means to cool the planet.

16Saving Notre Dame

Engineers race to rebuild the roof of the Notre Dame cathedral and secure the medieval structure within five years.

1Secrets in Our DNA

What can DNA testing companies reveal about our ancestry and health, and at what risk?

2Beyond the Elements: Reactions

The chemical reactions that transform the world, from explosions to photosynthesis; lock-and-key molecules that put the heat in peppers and make venoms useful to medicine.

3Beyond the Elements: Indestructible

The potential environmental impact of virtually indestructible versions of glass, rubber and plastic.

4Beyond the Elements: Life

The molecules that allowed life on Earth to begin and thrive; how scientists use evolution in chemistry.

5Looking for Life on Mars

Follow along as NASA launches the Mars 2020 mission, perhaps the most ambitious hunt yet for signs of ancient life on Mars.

6Picture a Scientist

Women make up less than one-quarter of the amount of people employed in STEM, and the number is even smaller for women of color.

7Reef Rescue

Marine biologists from the Bahamas to Christmas Island to Australia fight against the clock to save the coral reefs from extinction.

8Fighting for Fertility

9Hindenburg The New Evidence

On May 6, 1937, the Hindenburg, the world's largest airship, ignited in a giant fireball as it prepared to land at Lakehurst, New Jersey-a disaster immortalized by searing newsreel footage and Herbert Morrison's unforgettable "Oh, the humanity!" commentary. The chain of events that ignited Hindenburg's hydrogen remains one of the biggest mysteries in aviation history. Theories range from deliberate sabotage to sparks generated by static electricity or stormy weather conditions. Now, more than 80 years later, new footage has surfaced: an amateur 8mm film that shows the airship's final seconds from a fresh angle and in unrivaled clarity. Taking clues from the footage and other sources, a leading CalTech chemical engineer walks NOVA viewers through a novel set of experiments designed to test the likeliest scenarios that led to the Hindenburg's ignition-some never tried before and others staged with a meticulous attention to authenticity. The result is a gripping, authoritative new investigation of one of history's most iconic disasters.

10Great Electric Airplane Race

The race to develop a practical and economically-viable electrically-powered airplane.

11Ship That Changed the World

A newly discovered 500-year-old wreck offers vital clues to the evolution in ship design that made long-distance voyages practical.

12Bat Superpowers

Understanding bats, their long life spans and why they are resistant to the very diseases they carry such as Ebola and MERS, as well as other diseases like cancer.

13The Cannabis Question

14Particles Unknown

An international team studies the neutrino, the most common yet least understood particle in the universe.

15Arctic Drift

16Edible Insects

17Universe Revealed: Age of Stars

The Hubble Space Telescope and a heat-resistant solar probe reveal new clues about the sun's 5-billion-year history.

18Universe Revealed: Milky Way

19Universe Revealed: Alien Worlds

20Universe Revealed: Black Holes

21Universe Revealed: Big Bang

1High-Risk High-Rise

The science behind the risks of sky-high buildings, from structural limits to threats presented by wind, fire and earthquakes.

2Butterfly Blueprints

Scientists are discovering the secrets of butterflies and using that knowledge to improve technology.

3Alaskan Dinosaurs

Paleontologists discover that dinosaurs thrived in unlikely places such as the cold and dark Arctic Circle.

4Ancient Maya Metropolis

Why did the ancient Maya abandon their major cities?

5Arctic Sinkholes

Long-frozen permafrost is melting. How does the resulting release of methane affect us now and what will be the future effects?

6Dinosaur Apocalypse: The New Evidence

7Dinosaur Apocalypse: The Last Day

8Augmented

An inventor of bionic limbs, Hugh Herr, works with an injured climber and a surgeon to test a new amputation technique that allows prosthetic limbs to move and feel like the real thing.

10Ultimate Space Telescope

NASA's James Webb Space Telescope, from its conception to completion.

11Saving Venice

Built 1,600 years ago on a string of islands in a marshy area open to the Adriatic Sea, Venice is confronted with a multitude of scourges. Although in the 15th century extensive work was undertaken to combat the gradual silting up of the lagoon, this also resulted in more frequent flooding. Now a major travel destination, the Italian city welcomes millions of tourists every year, which further increases the risk of flooding: the huge wake of liners and cargo ships dangerously accelerates the erosion of the neighboring salt marshes, while the many motorboats speeding along its waterways damage the walls of the channels.

12Ending HIV in America

13Computers v. Crime

The hidden biases, privacy risks and design flaws of the artificial intelligence programs relied on by police departments and the courts.

22Why Ships Crash

When the Ever Given blocked the Suez Canal, it triggered a global crisis. Using eye-witnesses speaking for the first time, This investigation aims to find out what really happened.

23Ice Age Footprints

A look at what thousands of prehistoric footprints in New Mexico's White Sands National Park might reveal about the peopling of the Americas.

101Predicting My MS

The filmmaker looks back on his life, trying to understand why he contracted a rare form of Multiple Sclerosis: Primary Progressive Multiple Sclerosis.