7.66 avg 9 episodes 7.9 → 7.6 59 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Making of a Natural History Film | 7.9 | 28 |
| 2 | Where Did the Colorado Go? | 7.9 | 18 |
| 3 | Whales, Dolphins, and Men | 7.8 | 17 |
| 4 | The Search for Life | 7.9 | 13 |
| 5 | Last of the Cuiva | 6.7 | 11 |
| 6 | Strange Sleep | 7.6 | 20 |
| 7 | Crab Nebula | 8.0 | 14 |
| 10 | The First Signs of Washoe | 7.5 | 14 |
| 13 | The Mystery of the Anasazi | 7.6 | 13 |
7.73 avg 7 episodes 6.7 → 8.0
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Why Do Birds Sing? | 6.7 | 14 |
| 8 | War from the Air | 7.7 | 13 |
| 9 | What Time Is Your Body? | 8.0 | 10 |
| 10 | The Rise and Fall of DDT | 7.8 | 9 |
| 11 | Take the World from Another Point of View | 8.5 | 17 |
| 14 | The Plutonium Connection | 7.4 | 9 |
| 16 | The Lost World of the Maya | 8.0 | 13 |
7.72 avg 6 episodes 7.6 → 7.8
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | Joey | 7.6 | 10 |
| 4 | The Planets | 7.6 | 12 |
| 8 | The Race for the Double Helix | 8.5 | 18 |
| 12 | The Transplant Experiment | 7.6 | 10 |
| 18 | Inside the Shark | 7.2 | 9 |
| 20 | The Case of the Bermuda Triangle | 7.8 | 18 |
7.75 avg 6 episodes 7.9 → 8.0
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Hitler's Secret Weapon | 7.9 | 13 |
| 2 | The Hot Blooded Dinosaurs | 8.1 | 14 |
| 4 | The Sunspot Mystery | 7.6 | 14 |
| 5 | The Plastic Prison | 7.2 | 9 |
| 14 | The Red Planet | 7.7 | 10 |
| 17 | Linus Pauling: Crusading Scientist | 8.0 | 9 |
7.71 avg 7 episodes 7.5 → 8.0 58 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | In the Event of Catastrophe | 7.5 | 11 |
| 3 | One Small Step | 7.8 | 9 |
| 4 | The Final Frontier | 8.2 | 11 |
| 8 | The Case of the Ancient Astronauts | 7.7 | 23 |
| 9 | The Mind Machines | 7.2 | 9 |
| 18 | Memories from Eden | 7.6 | 10 |
| 19 | A Whisper from Space | 8.0 | 12 |
8.13 avg 3 episodes 7.8 → 7.8
| # | Title | Rating | Votes |
|---|---|---|---|
| 9 | A. Einstein | 7.8 | 11 |
| 12 | Life on a Silken Thread | 8.8 | 11 |
| 17 | The Bridge That Spanned the World | 7.8 | 9 |
8.00 avg 9 episodes 7.6 → 8.4
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Elusive Illness | 7.6 | 9 |
| 2 | A Is for Atom, B Is for Bomb | 8.1 | 11 |
| 10 | The Cancer Detectives of Lin Xian | 7.9 | 12 |
| 11 | The Sea Behind the Dunes | 8.4 | 10 |
| 14 | Voyager: Jupiter & Beyond | 8.1 | 14 |
| 17 | Moving Still | 8.5 | 10 |
| 18 | A Touch of Sensitivity | 7.2 | 10 |
| 19 | The Red Deer of Rhum | 7.8 | 8 |
| 20 | It's About Time | 8.4 | 18 |
7.96 avg 7 episodes 9.0 → 8.0
| # | Title | Rating | Votes |
|---|---|---|---|
| 4 | Anatomy of a Volcano | 9.0 | 10 |
| 5 | The Science of Murder | 7.8 | 10 |
| 8 | The Asteroid and the Dinosaur | 7.9 | 14 |
| 9 | Animal Olympians | 7.6 | 12 |
| 10 | Resolution on Saturn | 6.8 | 10 |
| 13 | The Great Violin Mystery | 8.6 | 14 |
| 19 | City Spaces, Human Places | 8.0 | 11 |
7.90 avg 3 episodes 8.0 → 7.9
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | Test-Tube Babies: A Daughter for Judy | 8.0 | 8 |
| 9 | Animal Impostors | 7.8 | 9 |
| 11 | The Case of the UFOs | 7.9 | 10 |
7.87 avg 9 episodes 8.4 → 8.0 58 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | The Pleasure of Finding Things Out | 8.4 | 44 |
| 4 | The Miracle of Life | 7.3 | 34 |
| 6 | City of Coral | 8.0 | 11 |
| 7 | Fat Chance in a Thin World | 7.8 | 8 |
| 9 | Signs of the Apes, Songs of the Whales | 7.8 | 9 |
| 12 | Papua New Guinea: Anthropology on Trial | 7.7 | 11 |
| 14 | A Magic Way of Going: The Story of Thoroughbreds | 8.0 | 13 |
| 17 | Twenty-Five Years in Space | 7.8 | 10 |
| 18 | Nuclear Strategy for Beginners | 8.0 | 12 |
7.58 avg 5 episodes 6.8 → 8.2
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Case of ESP | 6.8 | 13 |
| 3 | China's Only Child | 7.8 | 10 |
| 5 | Visions of the Deep: The Underwater World of Al Giddings | 7.0 | 9 |
| 13 | The Nomads of the Rain Forest | 8.1 | 13 |
| 19 | Stephen Jay Gould: This View of Life | 8.2 | 18 |
8.06 avg 9 episodes 8.0 → 8.6
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Edgerton and His Incredible Seeing Machines | 8.0 | 9 |
| 6 | The Shape of Things | 7.8 | 16 |
| 8 | The Mathematical Mystery Tour | 8.5 | 13 |
| 11 | The National Science Test II | 8.6 | 9 |
| 12 | Seeds of Tomorrow | 8.0 | 10 |
| 13 | What Einstein Never Knew | 7.7 | 11 |
| 15 | The Magic of Special Effects | 7.4 | 13 |
| 17 | Tornado! | 7.9 | 13 |
| 20 | The Plane that Changed the World | 8.6 | 21 |
7.75 avg 10 episodes 8.0 → 7.6
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Halley's Comet: Once in a Lifetime | 8.0 | 9 |
| 2 | Goddess of the Earth: Gaia | 7.8 | 8 |
| 4 | Life's First Feelings | 8.0 | 9 |
| 5 | The Case of the Frozen Addict | 7.7 | 14 |
| 12 | The Search for the Disappeared | 7.8 | 18 |
| 13 | The Planet that Got Knocked on its Side | 7.6 | 12 |
| 16 | Is Anybody Out There? | 8.0 | 9 |
| 17 | The Mystery of the Animal Pathfinders | 7.2 | 8 |
| 20 | Leprosy Can Be Cured! | 7.8 | 8 |
| 21 | How Babies Get Made | 7.6 | 8 |
7.95 avg 11 episodes 7.2 → 8.2
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Countdown to the Invisible Universe | 7.2 | 9 |
| 2 | Children of Eve | 9.0 | 11 |
| 3 | Why Planes Crash | 8.3 | 23 |
| 5 | Freud Under Analysis | 7.3 | 11 |
| 7 | Confessions of a Weaponeer | 9.0 | 10 |
| 11 | Rocky Road to Jupiter | 8.2 | 8 |
| 12 | Death of a Star | 7.0 | 13 |
| 13 | Spy Machines | 7.2 | 9 |
| 16 | A Man, a Plan, a Canal, Panama | 8.2 | 28 |
| 19 | Ancient Treasures from the Deep | 7.8 | 9 |
| 21 | Secrets of the Lost Red Paint People | 8.2 | 9 |
8.05 avg 14 episodes 8.2 → 7.6 60 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Top Gun and Beyond | 8.2 | 13 |
| 2 | How to Create a Junk Food | 7.9 | 13 |
| 3 | Buried in Ice | 8.2 | 18 |
| 7 | The Mystery of the Master Builders | 7.6 | 8 |
| 9 | The Man Who Loved Numbers | 7.9 | 12 |
| 10 | Race for the Superconductor | 6.2 | 8 |
| 12 | Pioneers of Surgery: The Brutal Craft (1) | 8.8 | 9 |
| 13 | Pioneers of Surgery: Into the Heart (2) | 8.8 | 9 |
| 14 | Pioneers of Surgery: New Organs for Old (3) | 8.8 | 9 |
| 15 | Pioneers of Surgery: Beyond the Knife (4) | 8.8 | 9 |
| 16 | Can the Vatican Save the Sistine Chapel? | 8.2 | 8 |
| 18 | Do Scientists Cheat? | 8.6 | 8 |
| 19 | Who Shot President Kennedy? | 7.1 | 17 |
| 20 | The Light Stuff | 7.6 | 8 |
7.66 avg 10 episodes 8.2 → 8.0
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | The Last Journey of a Genius | 8.2 | 16 |
| 3 | The Strange New Science of Chaos | 8.2 | 21 |
| 4 | Back to Chernobyl | 7.6 | 18 |
| 7 | Secrets of Easter Island: Part 1 | 7.2 | 8 |
| 9 | The World Is Full of Oil! | 7.2 | 9 |
| 11 | The Hidden City | 7.4 | 12 |
| 13 | Design Wars! | 7.8 | 8 |
| 16 | Hurricane! | 6.8 | 14 |
| 18 | What Is Music? | 8.2 | 13 |
| 21 | The Schoolboys Who Cracked the Soviet Secret | 8.0 | 11 |
7.68 avg 11 episodes 7.4 → 6.8 58 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Poison in the Rockies | 7.4 | 8 |
| 3 | Disguises of War | 8.0 | 8 |
| 6 | The Genius That Was China: Rise of the Dragon | 7.2 | 8 |
| 7 | The Genius That Was China: Empires in Collision | 7.8 | 8 |
| 10 | The KGB, the Computer and Me | 7.9 | 202 |
| 11 | Neptune's Cold Fury | 7.7 | 9 |
| 12 | To Boldly Go... | 7.9 | 10 |
| 14 | The Blimp Is Back! | 7.7 | 10 |
| 15 | Earthquake! | 8.1 | 23 |
| 18 | We Know Where You Live | 8.0 | 8 |
| 19 | In the Land of the Llamas | 6.8 | 8 |
8.10 avg 12 episodes 8.6 → 7.8 60 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Return to Mt. St. Helens | 8.6 | 14 |
| 2 | Con-Fusion in a Jar | 8.0 | 10 |
| 3 | The Chip vs. the Chessmaster | 8.2 | 14 |
| 4 | The Hunt for China's Dinosaurs (1) | 8.1 | 11 |
| 5 | Case of the Flying Dinosaur (2) | 7.8 | 12 |
| 6 | T. Rex Exposed | 8.1 | 13 |
| 7 | Russian Right Stuff: The Invisible Spaceman | 7.8 | 9 |
| 12 | So You Want to Be a Doctor? | 8.8 | 10 |
| 13 | Secrets of the Dead Sea Scrolls | 8.6 | 15 |
| 14 | Suicide Mission to Chernobyl | 7.9 | 13 |
| 15 | Taller Than Everest? | 7.5 | 9 |
| 17 | Avoiding the Surgeon's Knife | 7.8 | 9 |
7.74 avg 9 episodes 7.6 → 7.4 60 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | Submarine! | 7.6 | 8 |
| 5 | Can You Believe TV Ratings? | 7.4 | 8 |
| 9 | Eclipse of the Century | 8.2 | 11 |
| 10 | Animal Olympians II | 8.0 | 8 |
| 12 | Mind of a Serial Killer | 8.0 | 30 |
| 15 | This Old Pyramid | 7.7 | 15 |
| 16 | Iceman | 7.6 | 9 |
| 17 | Private Lives of Dolphins | 7.8 | 15 |
| 18 | Brain Transplant | 7.4 | 8 |
8.18 avg 6 episodes 8.2 → 7.9 58 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 3 | The Deadly Deception | 8.2 | 17 |
| 5 | In the Path of a Killer Volcano | 8.1 | 19 |
| 12 | Secrets of the Psychics | 8.2 | 83 |
| 15 | The Real Jurassic Park | 8.6 | 14 |
| 17 | Mysterious Crash of Flight 201 | 8.1 | 14 |
| 19 | The Best Mind Since Einstein | 7.9 | 18 |
7.66 avg 12 episodes 8.0 → 8.1 55 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Codebreakers | 8.0 | 10 |
| 2 | Dinosaurs of the Gobi | 7.9 | 10 |
| 3 | Daredevils of the Sky | 8.0 | 9 |
| 6 | In Search of Human Origins: Part I | 7.4 | 12 |
| 7 | In Search of Human Origins: Part II | 7.3 | 13 |
| 8 | In Search of Human Origins: Part III | 7.3 | 13 |
| 10 | Aircraft Carrier! | 8.0 | 9 |
| 12 | The Secret of the Wild Child | 7.6 | 126 |
| 16 | Killer Quake! | 7.6 | 19 |
| 18 | Rescue Mission in Space | 7.7 | 9 |
| 19 | Journey to the Sacred Sea | 7.0 | 8 |
| 20 | In Search of the First Language | 8.1 | 17 |
7.41 avg 18 episodes 7.6 → 6.2 58 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | Vikings in America | 7.6 | 14 |
| 3 | Little Creatures Who Run the World | 6.6 | 20 |
| 4 | Nazi Designers of Death | 8.3 | 9 |
| 6 | Mystery of the Senses: Hearing | 7.3 | 9 |
| 7 | Mystery of the Senses: Smell | 6.9 | 9 |
| 8 | Mystery of the Senses: Taste | 7.3 | 9 |
| 9 | Mystery of the Senses: Touch | 7.4 | 8 |
| 10 | Mystery of the Senses: Vision | 7.0 | 8 |
| 11 | The Universe Within | 8.4 | 15 |
| 12 | Making a Doctor | 7.6 | 11 |
| 14 | Anastasia: Dead or Alive? | 8.4 | 16 |
| 15 | Venus Unveiled | 8.0 | 9 |
| 16 | Hawaii Born of Fire | 7.2 | 9 |
| 17 | The Doomsday Asteroid | 7.3 | 10 |
| 18 | Lightning! | 7.8 | 13 |
| 19 | Hunt for the Serial Arsonist | 8.3 | 17 |
| 20 | Treasures of the Great Barrier Reef | 5.8 | 12 |
| 21 | Race to Catch a Buckyball | 6.2 | 8 |
7.84 avg 14 episodes 7.9 → 7.6 58 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | The Day the Earth Shook | 7.9 | 11 |
| 3 | B-29 Frozen in Time | 8.1 | 62 |
| 4 | Plague Fighters | 8.4 | 20 |
| 5 | War Machines of Tomorrow | 8.0 | 8 |
| 6 | Kidnapped by UFOs? The True Story of Alien Abductions | 7.8 | 18 |
| 7 | Flood! | 8.2 | 9 |
| 11 | Einstein Revealed | 7.7 | 15 |
| 14 | Secrets of Making Money | 7.8 | 8 |
| 15 | Top Gun Over Moscow | 8.4 | 11 |
| 16 | Shark Attack! | 7.0 | 11 |
| 17 | Odyssey of Life: The Ultimate Journey (1) | 7.8 | 11 |
| 18 | Odyssey of Life: The Unknown World (2) | 7.3 | 15 |
| 19 | Odyssey of Life: The Photographer's Secrets (3) | 7.7 | 13 |
| 20 | Cracking the Ice Age | 7.6 | 8 |
8.03 avg 16 episodes 8.1 → 8.4 87 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Kaboom! | 8.1 | 18 |
| 2 | Titanic's Lost Sister | 8.4 | 14 |
| 3 | Secrets of Lost Empires: Stonehenge (1) | 7.4 | 14 |
| 4 | Secrets of Lost Empires: Inca (2) | 7.8 | 16 |
| 5 | Secrets of Lost Empires: Obelisk (3) | 8.1 | 15 |
| 6 | Secrets of Lost Empires: Colosseum (4) | 8.5 | 16 |
| 7 | Hunt for Alien Worlds | 6.8 | 9 |
| 8 | Curse of T.rex | 8.3 | 9 |
| 10 | Kingdom of the Seahorse | 7.7 | 18 |
| 11 | Coma | 8.2 | 9 |
| 12 | Faster Than Sound | 8.1 | 11 |
| 14 | The Proof | 8.6 | 17 |
| 15 | Wild Wolves with David Attenborough | 7.9 | 11 |
| 16 | Super Bridge | 8.1 | 16 |
| 17 | Treasures of the Sunken City | 8.1 | 19 |
| 19 | Danger in the Jet Stream | 8.4 | 9 |
7.91 avg 12 episodes 8.5 → 8.0
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Night Creatures of the Kalahari | 8.5 | 9 |
| 2 | Mysterious Mummies of China | 7.8 | 12 |
| 3 | Supersonic Spies | 8.0 | 10 |
| 5 | The Brain Eater | 8.6 | 10 |
| 6 | Everest: The Death Zone | 7.6 | 18 |
| 8 | Warnings from the Ice | 7.8 | 9 |
| 9 | Crocodiles! With David Attenborough | 8.4 | 15 |
| 11 | Lost at Sea: The Search for Longitude | 7.4 | 11 |
| 12 | Chasing 'El Niño' | 7.6 | 7 |
| 13 | Terror in Space | 7.8 | 8 |
| 15 | Deadly Shadow of Vesuvius | 7.4 | 10 |
| 19 | Leopards of the Night with David Attenborough | 8.0 | 12 |
7.83 avg 13 episodes 7.1 → 7.0 77 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Beast of Loch Ness | 7.1 | 19 |
| 2 | Submarines, Secrets, and Spies | 8.0 | 9 |
| 4 | Escape: Because Accidents Happen, Car Crash | 8.5 | 9 |
| 5 | Escape: Because Accidents Happen, Fire | 8.5 | 9 |
| 6 | Escape: Because Accidents Happen, Abandon Ship | 8.0 | 8 |
| 7 | Escape: Because Accidents Happen, Plane Crash | 8.0 | 8 |
| 10 | To the Moon | 8.4 | 33 |
| 11 | Fall of the Leaning Tower | 7.6 | 8 |
| 12 | Time Travel | 7.5 | 11 |
| 13 | The Killer's Trail: The Story of Dr. Sam Sheppard | 7.4 | 16 |
| 14 | Island of the Spirits | 7.8 | 9 |
| 15 | Decoding Nazi Secrets | 8.0 | 18 |
| 16 | Voyage of Doom | 7.0 | 10 |
7.52 avg 19 episodes 8.0 → 7.6 120 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Tales from the Hive | 8.0 | 26 |
| 2 | Lost on Everest | 8.2 | 25 |
| 3 | Secrets of Lost Empires: Medieval Siege | 7.5 | 17 |
| 5 | Secrets of Lost Empires: Pharaoh's Obelisk | 8.0 | 18 |
| 6 | Trillion Dollar Bet | 7.4 | 54 |
| 7 | Secrets of Lost Empires: Easter Island | 6.6 | 27 |
| 8 | Mystery of the First Americans | 8.0 | 13 |
| 9 | Secrets of Lost Empires: Roman Bath | 7.9 | 26 |
| 10 | Lost Tribes of Israel | 7.4 | 13 |
| 11 | Secrets of Lost Empires: China Bridge | 7.2 | 23 |
| 12 | What's Up with the Weather? | 7.5 | 13 |
| 14 | The Vikings | 7.8 | 17 |
| 15 | Lincoln's Secret Weapon | 7.5 | 15 |
| 16 | Holocaust on Trial | 6.9 | 16 |
| 17 | Hitler's Lost Sub | 7.9 | 51 |
| 18 | Runaway Universe | 7.7 | 22 |
| 19 | Garden of Eden | 6.4 | 8 |
| 20 | Dying to Be Thin | 7.3 | 38 |
| 21 | Japan's Secret Garden | 7.6 | 16 |
7.67 avg 15 episodes 7.9 → 8.0 89 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | Vanished! | 7.9 | 13 |
| 3 | Nazi Prison Escape | 8.3 | 17 |
| 4 | Lost King of the Maya | 7.4 | 38 |
| 5 | Cancer Warrior | 7.1 | 11 |
| 9 | Cracking the Code of Life | 7.3 | 27 |
| 10 | Harvest of Fear | 8.0 | 13 |
| 11 | Search for a Safe Cigarette | 7.6 | 15 |
| 12 | 18 Ways to Make a Baby | 7.0 | 9 |
| 13 | Secrets of the Mind | 7.7 | 48 |
| 14 | Sex: Unknown | 7.6 | 14 |
| 15 | Russia's Nuclear Warriors | 7.2 | 10 |
| 16 | Bioterror | 8.4 | 12 |
| 17 | Life's Greatest Miracle | 7.4 | 29 |
| 18 | Methuselah Tree | 8.2 | 12 |
| 19 | Flying Casanovas | 8.0 | 11 |
7.48 avg 15 episodes 7.1 → 7.2 87 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Death Star | 7.1 | 25 |
| 2 | Neanderthals on Trial | 7.8 | 16 |
| 3 | Fireworks! | 6.1 | 11 |
| 4 | Secrets, Lies, and Atomic Spies | 7.3 | 17 |
| 5 | The Missing Link | 7.6 | 10 |
| 6 | Shackleton's Voyage of Endurance | 8.7 | 44 |
| 7 | Why the Towers Fell | 7.4 | 124 |
| 8 | Fire Wars | 7.7 | 17 |
| 9 | Killer Disease on Campus | 7.7 | 12 |
| 10 | Mysterious Life of Caves | 6.7 | 16 |
| 11 | Lost Roman Treasure | 8.1 | 15 |
| 12 | Galileo's Battle for the Heavens | 7.3 | 58 |
| 13 | Volcano's Deadly Warning | 8.0 | 10 |
| 14 | Sinking City of Venice | 7.5 | 19 |
| 15 | The Orchid Hunter | 7.2 | 8 |
7.44 avg 16 episodes 6.7 → 6.7 63 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Spies That Fly | 6.7 | 15 |
| 2 | Last Flight of Bomber 31 | 7.4 | 11 |
| 3 | Ancient Creature of the Deep | 6.9 | 12 |
| 4 | Battle of the X-Planes | 8.3 | 64 |
| 5 | Mountain of Ice | 7.5 | 27 |
| 6 | Lost Treasures of Tibet | 6.7 | 42 |
| 7 | Dirty Bomb (NOVA) | 8.0 | 14 |
| 9 | Secret of Photo 51 | 8.3 | 32 |
| 10 | Infinite Secrets | 7.7 | 20 |
| 11 | Who Killed the Red Baron? | 7.2 | 20 |
| 12 | The Elegant Universe: Einstein's Dream (1) | 7.7 | 71 |
| 13 | The Elegant Universe: String's the Thing (2) | 7.8 | 43 |
| 14 | The Elegant Universe: Welcome to the 11th Dimension (3) | 7.0 | 14 |
| 15 | Wright Brothers' Flying Machine | 7.4 | 31 |
| 16 | Magnetic Storm | 7.7 | 57 |
| 17 | Volcano Above the Clouds | 6.7 | 24 |
7.69 avg 18 episodes 7.8 → 7.3 56 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Mars Dead or Alive | 7.8 | 52 |
| 2 | Secrets of the Crocodile Caves | 6.5 | 10 |
| 3 | Dogs and More Dogs | 7.5 | 33 |
| 4 | Descent Into the Ice | 7.0 | 17 |
| 5 | Crash of Flight 111 | 8.1 | 29 |
| 6 | Life and Death in the War Zone | 8.1 | 33 |
| 7 | Hunt for the Supertwister | 7.6 | 39 |
| 8 | World in the Balance: The People Paradox | 8.0 | 15 |
| 9 | World in the Balance: China Revs Up | 7.8 | 28 |
| 10 | Battle Plan Under Fire | 7.3 | 12 |
| 11 | Origins: Earth Is Born | 7.8 | 45 |
| 12 | Origins: How Life Began | 7.5 | 54 |
| 13 | Origins: Where Are the Aliens? | 7.9 | 68 |
| 14 | Origins: Back to the Beginning | 8.1 | 46 |
| 15 | The Most Dangerous Woman in America | 7.8 | 25 |
| 16 | America's Stone Age Explorers | 8.1 | 24 |
| 17 | History's Great Escapes | 8.2 | 28 |
| 18 | Ancient Refuge in the Holy Land | 7.3 | 24 |
7.91 avg 14 episodes 7.7 → 7.7 56 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Welcome to Mars | 7.7 | 54 |
| 2 | The Boldest Hoax | 7.7 | 14 |
| 3 | Supersonic Dream | 8.2 | 18 |
| 5 | The Viking Deception | 8.2 | 25 |
| 6 | Saving the National Treasures | 7.5 | 10 |
| 7 | A Daring Flight | 8.0 | 17 |
| 8 | Wave That Shook the World | 8.2 | 43 |
| 11 | Mystery of the Megaflood | 8.4 | 56 |
| 12 | Sinking the Supership | 7.7 | 31 |
| 13 | E=mc²: Einstein's Big Idea | 8.1 | 172 |
| 14 | Volcano Under the City | 8.1 | 20 |
| 15 | Hitler's Sunken Secret | 7.5 | 32 |
| 16 | Newton's Dark Secrets | 7.7 | 68 |
| 17 | Storm That Drowned a City | 7.7 | 35 |
7.48 avg 17 episodes 7.4 → 8.2 57 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Mummy Who Would Be King | 7.4 | 19 |
| 3 | Deadly Ascent | 7.1 | 16 |
| 4 | The Perfect Corpse | 7.6 | 20 |
| 5 | Jewel of the Earth | 7.8 | 28 |
| 6 | The Ghost Particle | 7.6 | 15 |
| 7 | Arctic Passage: Prisoners of the Ice | 8.4 | 31 |
| 8 | Arctic Passage: Ice Survivors | 7.8 | 13 |
| 9 | The Great Robot Race | 7.4 | 41 |
| 10 | Voyage to the Mystery Moon | 6.9 | 19 |
| 11 | Dimming the Sun | 8.0 | 29 |
| 12 | Building on Ground Zero | 5.9 | 19 |
| 13 | Mystery of the Megavolcano | 7.5 | 37 |
| 15 | The Deadliest Plane Crash | 8.1 | 47 |
| 16 | Monster of the Milky Way | 8.0 | 74 |
| 17 | Wings of Madness | 7.1 | 28 |
| 18 | Family That Walks on All Fours | 6.3 | 15 |
| 20 | Underwater Dream Machine | 8.2 | 18 |
7.55 avg 15 episodes 8.1 → 7.0 72 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 2 | Forgotten Genius | 8.1 | 71 |
| 3 | The Last Great Ape | 8.4 | 19 |
| 4 | Kings of Camouflage | 8.4 | 47 |
| 5 | First Flower | 6.9 | 28 |
| 6 | Saved by the Sun | 7.8 | 30 |
| 7 | Pocahontas Revealed | 7.0 | 29 |
| 9 | Bone Diggers | 7.8 | 21 |
| 10 | The Great Inca Rebellion | 7.0 | 59 |
| 13 | Secrets of the Samurai Sword | 7.8 | 73 |
| 14 | Ghost in Your Genes | 7.9 | 38 |
| 15 | Marathon Challenge | 6.2 | 26 |
| 16 | Sputnik Declassified | 7.3 | 34 |
| 17 | Judgment Day: Intelligent Design on Trial | 8.5 | 211 |
| 18 | Master of the Killer Ants | 7.1 | 18 |
| 19 | Missing in MiG Alley | 7.0 | 29 |
7.61 avg 19 episodes 8.0 → 7.3 60 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Absolute Zero: The Conquest of Cold | 8.0 | 67 |
| 2 | Absolute Zero: The Race for Absolute Zero | 8.1 | 81 |
| 3 | Secrets of the Parthenon | 7.6 | 80 |
| 4 | Astrospies | 7.7 | 43 |
| 5 | Ape Genius | 8.1 | 46 |
| 6 | The Four-Winged Dinosaur | 7.7 | 35 |
| 7 | Cracking the Maya Code | 7.8 | 83 |
| 8 | Car of the Future | 7.4 | 39 |
| 9 | A Walk to Beautiful | 7.7 | 16 |
| 10 | Lord of the Ants | 6.9 | 49 |
| 11 | Arctic Dinosaurs | 7.1 | 41 |
| 12 | Space Shuttle Disaster | 7.4 | 39 |
| 13 | Parallel Worlds, Parallel Lives | 7.7 | 28 |
| 14 | Hunting the Hidden Dimension | 7.9 | 188 |
| 15 | Alien from Earth | 7.3 | 42 |
| 16 | The Bible's Buried Secrets | 7.6 | 118 |
| 17 | Ocean Animal Emergency | 8.0 | 26 |
| 18 | Is There Life on Mars? | 7.2 | 33 |
| 19 | The Big Energy Gamble | 7.3 | 38 |
7.66 avg 16 episodes 7.7 → 8.2 65 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | The Incredible Journey of the Butterflies | 7.7 | 84 |
| 2 | The Spy Factory | 7.1 | 87 |
| 3 | Rat Attack | 7.8 | 40 |
| 4 | Extreme Ice | 7.4 | 84 |
| 5 | Megabeasts' Sudden Death | 7.7 | 35 |
| 6 | Doctors' Diaries: Part One | 7.9 | 28 |
| 7 | Doctors' Diaries: Part Two | 8.5 | 27 |
| 8 | Musical Minds | 7.3 | 27 |
| 9 | Darwin's Darkest Hour | 7.0 | 209 |
| 10 | Hubble's Amazing Rescue | 7.3 | 50 |
| 11 | Lizard Kings | 7.8 | 42 |
| 12 | Becoming Human: First Steps | 7.9 | 166 |
| 13 | Becoming Human: Birth of Humanity | 7.9 | 141 |
| 14 | Becoming Human: Last Human Standing | 8.0 | 129 |
| 15 | What Are Dreams? | 7.1 | 122 |
| 16 | What Darwin Never Knew | 8.2 | 143 |
7.26 avg 17 episodes 7.1 → 7.1 53 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Killer Subs in Pearl Harbor | 7.1 | 34 |
| 2 | Building Pharaoh's Ship | 6.9 | 42 |
| 3 | Riddles of the Sphinx | 6.9 | 63 |
| 4 | Ghosts of Machu Picchu | 7.5 | 94 |
| 5 | Extreme Cave Diving | 7.3 | 47 |
| 6 | The Pluto Files | 7.6 | 82 |
| 7 | Hunting the Edge of Space: The Mystery of the Milky Way | 7.9 | 71 |
| 8 | Hunting the Edge of Space: The Ever-Expanding Universe | 7.6 | 59 |
| 9 | Mind Over Money | 7.2 | 72 |
| 10 | Mt. St. Helens Back from the Dead | 7.2 | 46 |
| 11 | Building the Great Cathedrals | 7.0 | 117 |
| 12 | Emergency Mine Rescue | 7.2 | 30 |
| 13 | Trapped in an Elevator | 7.3 | 25 |
| 14 | Dogs Decoded | 7.8 | 162 |
| 15 | Secrets of Stonehenge | 7.1 | 56 |
| 16 | Quest for Solomon's Mines | 6.7 | 38 |
| 17 | Secrets Beneath the Ice | 7.1 | 53 |
7.71 avg 19 episodes 7.1 → 8.3 55 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Deadliest Earthquakes | 7.1 | 44 |
| 2 | Making Stuff: Stronger | 8.1 | 55 |
| 3 | Making Stuff: Smaller | 7.9 | 54 |
| 4 | Making Stuff: Cleaner | 8.0 | 46 |
| 5 | Smartest Machine on Earth | 7.6 | 49 |
| 6 | Making Stuff: Smarter | 8.3 | 55 |
| 7 | Crash of Flight 447 | 7.2 | 71 |
| 8 | Venom: Nature's Killer | 7.3 | 39 |
| 9 | Japan's Killer Quake | 7.7 | 69 |
| 10 | Power Surge | 7.0 | 27 |
| 11 | Engineering Ground Zero | 7.1 | 26 |
| 12 | Surviving the Tsunami | 7.0 | 29 |
| 13 | Finding Life Beyond Earth: Are We Alone? | 8.0 | 93 |
| 14 | Finding Life Beyond Earth: Moons and Beyond | 7.6 | 21 |
| 15 | Iceman Murder Mystery | 7.2 | 63 |
| 16 | The Fabric of the Cosmos: What is Space? | 8.4 | 231 |
| 17 | The Fabric of the Cosmos: The Illusion of Time | 8.3 | 218 |
| 18 | The Fabric of the Cosmos: Quantum Leap | 8.4 | 218 |
| 19 | The Fabric of the Cosmos: Universe or Multiverse? | 8.3 | 170 |
7.33 avg 16 episodes 6.9 → 7.4 61 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Deadliest Volcanoes | 6.9 | 62 |
| 2 | Bombing Hitler's Dams | 7.4 | 68 |
| 3 | 3D Spies of WWII | 7.8 | 74 |
| 4 | Mystery of a Masterpiece | 7.5 | 89 |
| 5 | Ice Age Death Trap | 7.0 | 82 |
| 6 | Separating Twins | 7.5 | 24 |
| 7 | Cracking Your Genetic Code | 7.5 | 62 |
| 8 | Hunting the Elements | 7.8 | 123 |
| 9 | Deadliest Tornadoes | 6.9 | 112 |
| 10 | Why Ships Sink | 6.8 | 99 |
| 11 | Secrets of the Sun | 7.5 | 102 |
| 12 | Secrets of the Viking Sword | 7.3 | 196 |
| 13 | Forensics on Trial | 7.2 | 72 |
| 14 | Mystery of Easter Island | 7.3 | 125 |
| 15 | Ultimate Mars Challenge | 7.4 | 185 |
| 16 | Inside the Megastorm | 7.4 | 33 |
7.35 avg 24 episodes 7.5 → 7.4 56 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Doomsday Volcanoes | 7.5 | 46 |
| 2 | Decoding Neanderthals | 7.5 | 140 |
| 3 | Rise of the Drones | 7.4 | 124 |
| 4 | Who Killed Lindbergh's Baby? | 6.6 | 203 |
| 5 | Building Pharaoh's Chariot | 6.9 | 99 |
| 6 | Earth from Space | 8.3 | 96 |
| 7 | Mind of a Rampage Killer | 6.1 | 223 |
| 8 | Meteor Strike | 7.6 | 109 |
| 9 | Ancient Computer | 8.3 | 67 |
| 10 | Australia's First 4 Billion Years: Awakening | 7.8 | 89 |
| 11 | Australia's First 4 Billion Years: Life Explodes | 7.6 | 73 |
| 12 | Australia's First 4 Billion Years: Monsters | 7.7 | 78 |
| 13 | Australia's First 4 Billion Years: Strange Creatures | 7.7 | 69 |
| 14 | Oklahoma's Deadliest Tornadoes | 6.3 | 61 |
| 15 | Manhunt: Boston Bombers | 6.9 | 136 |
| 16 | Ground Zero Supertower | 7.0 | 167 |
| 17 | Megastorm Aftermath | 6.7 | 90 |
| 18 | Making Stuff Faster | 7.8 | 46 |
| 19 | Making Stuff Wilder | 7.8 | 45 |
| 20 | Making Stuff Colder | 7.8 | 43 |
| 21 | Making Stuff Safer | 7.5 | 38 |
| 22 | Cold Case JFK | 6.9 | 256 |
| 23 | At the Edge of Space | 7.3 | 76 |
| 24 | Asteroid: Doomsday or Payday? | 7.4 | 69 |
7.27 avg 23 episodes 7.3 → 7.7 57 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Alien Planets Revealed | 7.3 | 81 |
| 2 | Zeppelin Terror Attack | 8.0 | 47 |
| 3 | Killer Typhoon | 6.5 | 305 |
| 4 | Ghosts of Murdered Kings | 7.3 | 49 |
| 5 | Roman Catacomb Mystery | 6.9 | 47 |
| 6 | Great Cathedral Mystery | 8.2 | 72 |
| 7 | Wild Predator Invasion | 6.1 | 14 |
| 8 | Inside Animal Minds: Bird Genius | 8.0 | 43 |
| 9 | Inside Animal Minds: Dogs & Super Senses | 7.8 | 47 |
| 10 | Inside Animal Minds: Who's the Smartest? | 7.4 | 44 |
| 11 | Why Sharks Attack | 6.1 | 95 |
| 12 | Escape from Nazi Alcatraz | 7.4 | 48 |
| 13 | D-Day's Sunken Secrets | 8.0 | 46 |
| 14 | Vaccines - Calling the Shots | 7.1 | 94 |
| 15 | Rise of the Hackers | 7.4 | 169 |
| 16 | Why Planes Vanish | 7.5 | 125 |
| 17 | Surviving Ebola | 6.7 | 36 |
| 18 | Ben Franklin's Balloons | 6.5 | 53 |
| 19 | First Air War | 7.3 | 87 |
| 20 | Bigger Than T. Rex | 7.4 | 161 |
| 21 | Emperor's Ghost Army | 7.5 | 145 |
| 22 | Killer Landslides | 7.2 | 93 |
| 23 | First Man on the Moon | 7.7 | 132 |
7.52 avg 21 episodes 7.9 → 7.8 57 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Big Bang Machine | 7.9 | 51 |
| 2 | Sunken Ship Rescue | 7.9 | 78 |
| 3 | Sinkholes-Buried Alive | 7.4 | 58 |
| 4 | Colosseum: Roman Death Trap | 7.5 | 82 |
| 5 | Petra: Lost City of Stone | 7.6 | 117 |
| 6 | Hagia Sophia: Istanbul's Mystery | 7.5 | 95 |
| 7 | The Great Math Mystery | 7.6 | 196 |
| 8 | Invisible Universe Revealed | 8.1 | 88 |
| 9 | Nazi Attack on America | 7.8 | 85 |
| 10 | Lethal Seas | 7.3 | 49 |
| 11 | Chasing Pluto | 7.8 | 81 |
| 12 | Nuclear Meltdown Disaster | 7.4 | 51 |
| 13 | Dawn of Humanity | 7.8 | 192 |
| 14 | Arctic Ghost Ship | 7.3 | 138 |
| 15 | Secrets of Noah's Ark | 6.3 | 118 |
| 16 | Cyberwar Threat | 7.3 | 99 |
| 17 | Animal Mummies | 6.8 | 31 |
| 18 | Making North America: Origins | 7.7 | 100 |
| 19 | Making North America: Life | 7.6 | 84 |
| 20 | Making North America: Human | 7.5 | 74 |
| 21 | Inside Einstein's Mind | 7.8 | 97 |
7.42 avg 20 episodes 7.2 → 7.7 62 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Secret Tunnel Warfare | 7.2 | 45 |
| 2 | Life's Rocky Start | 7.5 | 131 |
| 3 | Mystery Beneath the Ice | 7.4 | 43 |
| 4 | Himalayan Megaquake | 7.4 | 48 |
| 5 | Creatures of Light | 7.6 | 65 |
| 6 | Memory Hackers | 7.5 | 207 |
| 7 | Iceman Reborn | 7.5 | 117 |
| 8 | Rise of the Robots | 6.6 | 76 |
| 9 | Vikings Unearthed | 6.9 | 108 |
| 10 | Can Alzheimer's Be Stopped? | 7.1 | 56 |
| 11 | Wild Ways | 7.8 | 55 |
| 12 | Operation Lighthouse Rescue | 7.6 | 61 |
| 13 | Bombing Hitler's Supergun | 7.6 | 68 |
| 14 | 15 Years of Terror | 6.6 | 84 |
| 15 | School of the Future | 6.8 | 53 |
| 16 | Great Human Odyssey | 8.0 | 87 |
| 17 | Super Tunnel | 7.8 | 65 |
| 18 | Treasures of the Earth: Gems | 7.8 | 89 |
| 19 | Treasures of the Earth: Metals | 8.0 | 73 |
| 20 | Treasures of the Earth: Power | 7.7 | 65 |
7.53 avg 21 episodes 7.4 → 8.1 52 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Secrets of the Sky Tombs | 7.4 | 77 |
| 2 | The Nuclear Option | 7.8 | 71 |
| 3 | Search for the Super Battery | 7.3 | 167 |
| 4 | Ultimate Cruise Ship | 7.4 | 72 |
| 5 | The Origami Revolution | 8.0 | 57 |
| 6 | Why Trains Crash | 7.1 | 99 |
| 7 | Holocaust Escape Tunnel | 7.1 | 69 |
| 8 | Building Chernobyl's Mega Tomb | 7.6 | 322 |
| 9 | Chinese Chariot Revealed | 7.0 | 77 |
| 10 | Poisoned Water | 7.9 | 141 |
| 11 | Eclipse Over America | 7.5 | 70 |
| 12 | Death Dive to Saturn | 7.5 | 404 |
| 13 | Secrets of the Shining Knight | 7.2 | 171 |
| 14 | Ghosts of Stonehenge | 7.2 | 84 |
| 15 | Secrets of the Forbidden City | 7.6 | 75 |
| 16 | Killer Volcanoes | 7.6 | 98 |
| 17 | Killer Hurricanes | 7.3 | 73 |
| 18 | Killer Floods | 7.6 | 92 |
| 19 | Extreme Animal Weapons | 7.6 | 69 |
| 20 | Bird Brain | 8.4 | 101 |
| 21 | Day the Dinosaurs Died | 8.1 | 125 |
7.70 avg 22 episodes 8.0 → 7.7 67 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Black Hole Apocalypse | 8.0 | 1,061 |
| 2 | The Impossible Flight | 7.2 | 82 |
| 3 | First Face of America | 7.2 | 294 |
| 4 | Great Escape at Dunkirk | 7.4 | 79 |
| 5 | Prediction by the Numbers | 7.0 | 406 |
| 6 | Decoding the Weather Machine | 8.1 | 169 |
| 7 | Rise of the Superstorms | 7.6 | 61 |
| 8 | Transplanting Hope | 7.8 | 44 |
| 9 | Operation Bridge Rescue | 7.9 | 62 |
| 10 | Volcano on Fire | 7.4 | 34 |
| 11 | Volcano on the Brink | 6.9 | 33 |
| 12 | Addiction | 7.8 | 48 |
| 13 | Flying Supersonic | 7.8 | 59 |
| 14 | The Last B-24 | 7.4 | 65 |
| 15 | Thai Cave Rescue | 7.2 | 144 |
| 16 | World's Fastest Animal | 8.3 | 45 |
| 17 | Apollo's Daring Mission | 8.4 | 57 |
| 102 | NOVA Wonders: What's Living in You? | 8.9 | 9 |
| 103 | NOVA Wonders: Are We Alone? | 7.7 | 8 |
| 104 | NOVA Wonders: Can We Build a Brain? | 8.0 | 8 |
| 105 | NOVA Wonders: Can We Make Life? | 7.7 | 11 |
| 106 | NOVA Wonders: What's The Universe Made Of? | 7.7 | 10 |
7.88 avg 24 episodes 7.8 → 8.3 56 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Pluto and Beyond | 7.8 | 105 |
| 2 | Einstein's Quantum Riddle | 7.8 | 163 |
| 3 | Kilauea: Hawai'i on Fire | 7.8 | 70 |
| 4 | Decoding the Great Pyramid | 7.5 | 123 |
| 5 | Rise of the Rockets | 7.9 | 61 |
| 6 | The Next Pompeii | 7.6 | 58 |
| 7 | Saving the Dead Sea | 7.9 | 44 |
| 8 | Inside the Megafire | 7.6 | 45 |
| 9 | First Horse Warriors | 7.8 | 61 |
| 10 | Lost Viking Army | 7.1 | 63 |
| 11 | Back to the Moon | 8.0 | 76 |
| 12 | The Planets: Inner Worlds | 8.2 | 121 |
| 13 | The Planets: Mars | 8.2 | 94 |
| 14 | The Planets: Jupiter | 8.5 | 90 |
| 15 | The Planets: Saturn | 8.5 | 102 |
| 16 | The Planets: Ice Worlds | 8.5 | 80 |
| 17 | Why Bridges Collapse | 7.8 | 66 |
| 18 | Look Who's Driving | 8.0 | 58 |
| 19 | Rise of the Mammals | 7.6 | 105 |
| 20 | Dead Sea Scroll Detectives | 7.4 | 71 |
| 21 | Decoding da Vinci | 7.9 | 114 |
| 22 | The Violence Paradox | 7.4 | 99 |
| 23 | Animal Espionage | 7.9 | 39 |
| 101 | Black Hole Universe | 8.3 | 40 |
7.91 avg 16 episodes 8.4 → 7.6 63 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Polar Extremes | 8.4 | 106 |
| 2 | Dog Tales | 7.9 | 97 |
| 3 | Cat Tales | 8.0 | 113 |
| 4 | Mysteries of Sleep | 7.6 | 91 |
| 5 | Cuba's Cancer Hope | 8.1 | 55 |
| 6 | The Truth About Fat | 7.6 | 110 |
| 7 | Decoding COVID-19 | 7.7 | 57 |
| 8 | Eagle Power | 8.0 | 64 |
| 9 | Human Nature | 8.1 | 55 |
| 10 | The Secret Mind of Slime | 8.1 | 74 |
| 11 | A to Z: The First Alphabet | 8.1 | 105 |
| 12 | A to Z: How Writing Changed the World | 8.3 | 94 |
| 13 | Nature's Fear Factor | 7.6 | 78 |
| 14 | Touching the Asteroid | 7.9 | 73 |
| 15 | Can We Cool the Planet? | 7.5 | 89 |
| 16 | Saving Notre Dame | 7.6 | 68 |
7.42 avg 26 episodes 7.5 → 7.1 55 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Secrets in Our DNA | 7.5 | 94 |
| 2 | Beyond the Elements: Reactions | 7.3 | 25 |
| 3 | Beyond the Elements: Indestructible | 7.8 | 63 |
| 4 | Beyond the Elements: Life | 7.4 | 51 |
| 5 | Looking for Life on Mars | 7.2 | 90 |
| 6 | Picture a Scientist | 7.5 | 54 |
| 7 | Reef Rescue | 7.2 | 43 |
| 8 | Fighting for Fertility | 6.2 | 34 |
| 9 | Hindenburg: The New Evidence | 7.5 | 124 |
| 10 | Great Electric Airplane Race | 7.3 | 69 |
| 11 | The Ship That Changed the World | 7.0 | 91 |
| 12 | Bat Superpowers | 7.9 | 69 |
| 13 | The Cannabis Question | 7.1 | 88 |
| 14 | Particles Unknown | 7.8 | 69 |
| 15 | Arctic Drift | 7.2 | 88 |
| 16 | Edible Insects | 7.1 | 59 |
| 17 | Universe Revealed: Age of Stars | 7.2 | 83 |
| 18 | Universe Revealed: Milky Way | 8.0 | 79 |
| 19 | Universe Revealed: Alien Worlds | 7.7 | 74 |
| 20 | Universe Revealed: Black Holes | 7.8 | 74 |
| 21 | Universe Revealed: Big Bang | 8.0 | 67 |
| 22 | High-Risk High-Rise | 7.6 | 78 |
| 23 | Butterfly Blueprints | 7.7 | 74 |
| 24 | Alaskan Dinosaurs | 7.4 | 83 |
| 25 | Ancient Maya Metropolis | 7.5 | 79 |
| 101 | Search Engine Breakdown | 7.1 | 25 |
7.47 avg 20 episodes 7.9 → 6.7 57 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Arctic Sinkholes | 7.9 | 129 |
| 2 | Secrets in the Scat | 6.7 | 50 |
| 3 | Great Mammoth Mystery | 8.0 | 94 |
| 4 | Augmented | 7.9 | 68 |
| 5 | Determined: Fighting Alzheimer's | 6.7 | 38 |
| 6 | Dinosaur Apocalypse: The New Evidence | 7.7 | 75 |
| 7 | Dinosaur Apocalypse: The Last Day | 8.1 | 68 |
| 8 | Why Ships Crash | 7.7 | 88 |
| 9 | Ice Age Footprints | 7.0 | 92 |
| 10 | Ultimate Space Telescope | 8.2 | 116 |
| 11 | Saving Venice | 7.1 | 92 |
| 12 | Ending HIV in America | 7.5 | 45 |
| 13 | Computers v. Crime | 7.3 | 59 |
| 14 | Can Psychedelics Cure? | 7.2 | 64 |
| 15 | Ocean Invaders | 8.5 | 63 |
| 16 | Nazca Desert Mystery | 7.3 | 95 |
| 17 | Crypto Decoded | 6.8 | 63 |
| 18 | Zero to Infinity | 7.2 | 81 |
| 19 | Rebuilding Notre Dame | 7.9 | 77 |
| 101 | Predicting My MS | 6.7 | 23 |
7.31 avg 17 episodes 7.5 → 6.5 54 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | London Super Tunnel | 7.5 | 74 |
| 2 | Star Chasers of Senegal | 6.7 | 63 |
| 3 | Ancient Builders of the Amazon | 7.5 | 87 |
| 4 | New Eye on the Universe | 7.2 | 95 |
| 5 | Weathering the Future | 7.5 | 15 |
| 6 | Chasing Carbon Zero | 7.5 | 11 |
| 8 | Hidden Volcano Abyss | 6.8 | 11 |
| 9 | Your Brain: Perception Deception | 6.9 | 21 |
| 10 | Your Brain: Who's in Control? | 7.1 | 22 |
| 11 | Ancient Earth: Birth of the Sky | 8.0 | 74 |
| 12 | Ancient Earth: Frozen | 8.1 | 66 |
| 13 | Ancient Earth: Life Rising | 8.0 | 59 |
| 14 | Ancient Earth: Inferno | 7.1 | 64 |
| 15 | Ancient Earth: Humans | 7.3 | 64 |
| 16 | Inside China's Tech Boom | 7.1 | 53 |
| 17 | The Battle to Beat Malaria | 7.4 | 47 |
| 18 | Lee and Liza's Family Tree | 6.5 | 37 |
7.29 avg 21 episodes 7.6 → 7.5 54 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | When Whales Could Walk | 7.6 | 88 |
| 2 | Easter Island Origins | 7.2 | 103 |
| 3 | Building the Eiffel Tower | 7.9 | 105 |
| 4 | Hunt for the Oldest DNA | 8.0 | 145 |
| 5 | A.I. Revolution | 7.6 | 73 |
| 6 | Great American Eclipse | 7.5 | 57 |
| 7 | Secrets in Your Data | 6.9 | 51 |
| 8 | Decoding the Universe: Cosmos | 7.7 | 82 |
| 9 | Sea Change: Bounty in the Gulf of Maine | 6.8 | 19 |
| 10 | Sea Change: Peril in the Gulf of Maine | 6.6 | 17 |
| 11 | Sea Change: Survival in the Gulf of Maine | 6.8 | 14 |
| 12 | Solar System: Storm Worlds | 7.5 | 50 |
| 13 | Solar System: Strange Worlds | 7.6 | 50 |
| 14 | Solar System: Volcano Worlds | 7.5 | 47 |
| 15 | Solar System: Icy Worlds | 7.5 | 48 |
| 16 | Solar System: Wandering Worlds | 7.9 | 47 |
| 17 | Decoding the Universe: Quantum | 7.6 | 84 |
| 18 | Building Stuff: Boost It! | 6.2 | 46 |
| 19 | Building Stuff: Reach It! | 7.0 | 44 |
| 20 | Building Stuff: Change It! | 6.2 | 36 |
| 21 | Lost Tombs of Notre Dame | 7.5 | 73 |
7.37 avg 20 episodes 6.8 → 7.7 58 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | What Are UFOs? | 6.8 | 101 |
| 2 | Extreme Airport Engineering | 6.9 | 55 |
| 3 | Dino Birds | 7.8 | 61 |
| 4 | Egypt's Tombs of Amun | 7.1 | 57 |
| 5 | Pompeii's Secret Underworld | 7.1 | 74 |
| 6 | Baltimore Bridge Collapse | 7.6 | 71 |
| 7 | Revolutionary War Weapons | 7.2 | 68 |
| 8 | Secrets of the Forest | 7.4 | 55 |
| 9 | Critical Condition: Health in Black America | 6.0 | 41 |
| 10 | Ultimate Crash Test: Countdown | 7.3 | 54 |
| 11 | Ultimate Crash Test: Impact | 7.4 | 44 |
| 12 | Human: Origins | 7.3 | 62 |
| 13 | Human: Journeys | 7.6 | 49 |
| 14 | Human: Neanderthal Encounters | 7.7 | 50 |
| 15 | Human: Into the Americas | 8.0 | 51 |
| 16 | Human: Building Empires | 7.7 | 51 |
| 17 | Ancient Desert Death Trap | 7.1 | 52 |
| 18 | Superfloods | 7.8 | 44 |
| 19 | Operation Space Station: High-Risk Build | 7.9 | 51 |
| 20 | Operation Space Station: Science and Survival | 7.7 | 45 |
7.54 avg 8 episodes 7.4 → 7.8 54 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Asteroids: Spark of Life? | 7.4 | 56 |
| 2 | Angkor: Hidden Jungle Empire | 7.4 | 46 |
| 3 | Can Dogs Talk? | 7.7 | 52 |
| 4 | Mammal Origins | 7.4 | 33 |
| 5 | Stone Age Temple Mystery | 7.2 | 42 |
| 6 | Return to the Moon | 7.6 | 48 |
| 7 | Rain Bombs | 7.8 | 39 |
| 8 | Athens: Birth of Democracy | 7.8 | 40 |