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Defenders of the WildDr. Dave Gaynor conducts a natural experiment and introduces lions and cheetahs into the Zambezi Delta to look at the role apex predators play, prey and adapt in the ecosystem.

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Defenders of the WildDr. Dave Gaynor conducts a natural experiment and introduces lions and cheetahs into the Zambezi Delta to look at the role apex predators play, prey and adapt in the ecosystem.0Defenders of the WildHunter's dollars fund sheep conservation across the U.S. and the story is told through a hands-on translocation reestablishing historic home range for bighorn sheep.

4th and Forever

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4th and Forever: Alcoa

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• Now Playing28minThe Battle of Pistol Creek, Part 2
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• Now Playing34minNever a Doubt

4th and Forever: DeSoto

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• Now Playing42minWin or Go Home
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4th and Forever: Muck City

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A Curious World

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• Now Playing9minBlack Holes
• Now Playing8minAncient Builders
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• Now Playing7minUnderwater Worlds
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• Now Playing8minWeather
• Now Playing7minFirst Life On Earth
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• Now Playing8minTime Tellers
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Age Of Big Cats

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Amazing Dinoworld

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American Icons

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• Now Playing13minBabe Ruth
• Now Playing14minFDR
• Now Playing14minTom Edison
• Now Playing12minMark Twain
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• Now Playing14minEleanor Roosevelt
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Ancient Earth

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• Now Playing11minThe Triassic
• Now Playing15minThe Cretaceous

Ancient Earth: Dinosaurs of the Frozen Continent

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• Now Playing51minWhat Lies Beneath

Ancient Engineering

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• Now Playing50minThe Power Of Water
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Ancient Yellowstone

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• Now Playing14minFrozen Archeology
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Besieged Fortresses, Battles Of Legend

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Beyond The Spotlight

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Big Picture Earth: Natural Sound

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Blindspots

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• Now Playing25minSeattle / Vancouver
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Bright Now, Part 1

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Bright Now, Part 2

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• Now Playing13minThe Sweet & Sour Of Florida Sugar
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• Now Playing12minPreparing for Hurricanes
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Butterfly Effect

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• Now Playing25minRace To The Moon
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Casey's Wild Backyard

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Celts: The Untold Story

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• Now Playing51minThe Art And War
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Changing Ocean Asia

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Classic Cars

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Curiosity Retreats Lectures

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• Now Playing52minFrontiers Of Science
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Curious Minds: Deepak Chopra

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• Now Playing38minA Beautiful Question, Part 2
• Now Playing34minThe Non Local Universe
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• Now Playing35minCosmic Evolution: Current Understanding Of The Universe
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• Now Playing33minSolution To The Hard Problem Of Consciousness

Deep Time History

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• Now Playing51minThe Age Of Discovery
• Now Playing51minThe Industrial Revolution And Modern Warfare

Destination: Mars

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• Now Playing19minPart 2: The Astronauts
• Now Playing17minPart 3: The Journey
• Now Playing12minPart 4: Surviving On Mars
• Now Playing15minPart 5: Why One Way?

Destination: Moon

• Now Playing15minChapter 1: A Matter Of Gravity
• Now Playing9minChapter 2: Water - The Big Question
• Now Playing14minChapter 3: From Outpost To Colony
• Now Playing11minChapter 4: Surviving....And Thriving?
• Now Playing11minChapter 5: Mars Direct Or Moon First?

Destination: Pluto

• Now Playing8minPart 1: Close Encounters Of The Plutonian Kind
• Now Playing7minPart 2: Pluto Or Bust
• Now Playing12minPart 3: Into The Kuiper Belt
• Now Playing9minPart 4: The Mapmaker's Dream
• Now Playing11minPart 5: Looking Back, Looking Forward
• Now Playing18minPart 7: Behind The Scenes With Alan Stern
• Now Playing10minPart 6: The Shoals Of Pluto
• Now Playing4minPart 9: The Pluto Flyby
• Now Playing5minPart 8: The "Giant Heart" On Pluto
• Now Playing4minPart 10: New Horizons Calls Home
• Now Playing8minPart 11: New Horizons - Pluto Flyby Images
• Now Playing8minPart 12: The Surface of Pluto
• Now Playing12minPart 13: The Right Stuff

Digits

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• Now Playing55minMan Vs. Machine
• Now Playing53minGuardians Of The Web

Doug To The Rescue

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• Now Playing29minLost Dogs of Louisiana
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• Now Playing30minPuerto Rico Rescue Pups
• Now Playing31minChasing Ghost
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• Now Playing26minBats Of Malawi
• Now Playing25minDixie Fire Foxes
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Dynamic Genomes

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Eat Like

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• Now Playing19minA Wolf
• Now Playing21minA Viking

Eat Me (Or Try Not To)

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• Now Playing50minThe Impact
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Eclipse Across America

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• Now Playing33minCoast To Coast: Part 2
• Now Playing15minEclipse Planet
• Now Playing25minWitnessing The Eclipse

Ecuador: On The Wild Side

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• Now Playing53minFrom The Andes To The Galapagos Islands

Engineering the Future

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• Now Playing59minAviation
• Now Playing57minFusion
• Now Playing57minTidal
• Now Playing52minMaritime
• Now Playing54minSolar
• Now Playing53minElectric Vehicles
• Now Playing52minThe Metaverse
• Now Playing52minHyperloop
• Now Playing52minThe Race To Space
• Now Playing52minPerpetual Power
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Evolve

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• Now Playing54minSurvive
• Now Playing53minCure
• Now Playing54minProtect
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FASTER!

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Future Cities Asia

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Giants

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• Now Playing53minElephants
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Growing Up

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HI$TORY With Peter Sagal

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History By The Numbers

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History: The Interesting Bits

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Illusions

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• Now Playing10minThe Classics
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Impossible Escapes: Civil War

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• Now Playing40minPauline Cushman: Tales Of A Yankee Spy
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Inside The Mind Of A Con Artist

• Now Playing53minMatthew Cox
• Now Playing52minChristophe Rocancourt
• Now Playing53minJan Lewan
• Now Playing53minFrédéric Bourdin
• Now Playing52minShaun Greenhalgh
• Now Playing52minHelmut Kiener

My Wild Backyard

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• Now Playing11minSouthern California
• Now Playing14minJanos Biosphere Reserve
• Now Playing14minNew York City
• Now Playing9minPatagonia

Nature Through Her Eyes

• Now Playing20minCall Of The Wild
• Now Playing15minWho Tells The Story?
• Now Playing16minClimbing The Mountain
• Now Playing14minOne World

Nature's Hidden Miracles

• Now Playing53minThe Secret Life Of Plants
• Now Playing53minInsects As Super Adapters
• Now Playing53minMicroorganisms, The Invisible Ruler

Normandy, Land Of Warriors

• Now Playing51minRollo The Viking: The Conquest
• Now Playing50minWilliam The Conqueror: The Rise
• Now Playing51minRichard The Lionheart: The Fall

NYC Revealed

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• Now Playing25minGrand Central Terminal
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Oddly Satisfying Science

• Now Playing25minScience on Fire
• Now Playing25minInvisible Impacts
• Now Playing25minWater, Water Everywhere
• Now Playing25minMagnificent Mixtures
• Now Playing25minUp and Atom
• Now Playing25minHot Hot Heat
• Now Playing25minExplosive Elements
• Now Playing26minColorful Conundrums
• Now Playing25minDon't Believe Your Eyes
• Now Playing24minThe Sound of Science

Oops, I Changed the World

• Now Playing52minConditioned
• Now Playing53minBlue Genes
• Now Playing52minThe Beat Goes On
• Now Playing53minFlash Of Success
• Now Playing53minSweet Success
• Now Playing53minAcid Test
• Now Playing52minHair Raising Science
• Now Playing52minDiscovering Drink
• Now Playing52minBigger Bang
• Now Playing52minLaxative Lunacy
• Now Playing53minGet A Grip
• Now Playing53minHow Saran Wrap Saved D-Day
• Now Playing53minSleeping On the Job
• Now Playing53minTeas & Tipple
• Now Playing53minLenin to Lady Gaga

Planet Insect

• Now Playing55minPart One: Small Creatures, Big Lives
• Now Playing55minPart Two: The Next Generation
• Now Playing57minPart Three: Hive Minds

Prescription: Nutrition

• Now Playing18minEpisode 1: Green Revolution
• Now Playing18minEpisode 2: Grain Of Truth
• Now Playing18minEpisode 3: Nature's Candy
• Now Playing16minEpisode 4: Spilling The Beans

Proof Of Concept

• Now Playing51minConceiving Consciousness
• Now Playing50minRandomness & Probability
• Now Playing50minTruth & Logical Paradox
• Now Playing50minThe Infinite

Rebuilding Ancient Rome

• Now Playing5minAra Pacis
• Now Playing4minBaths Of Caracalla
• Now Playing4minCircus Maximus
• Now Playing4minColosseum
• Now Playing3minCuria Julia
• Now Playing6minDomus Aurea Outside
• Now Playing3minForum Of Augustus
• Now Playing5minForum Of Peace
• Now Playing4minHarbor Of Trajan
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• Now Playing4minStadium Of Domitian
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Rescued Chimpanzees Of The Congo With Jane Goodall

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• Now Playing53minMaking Friends
• Now Playing53minThe Big Move
• Now Playing53minHope
• Now Playing51minPath to Freedom
• Now Playing50minHeroes
• Now Playing50minExpect the Unexpected
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• Now Playing50minAll Animals Welcome
• Now Playing51minReady to Go

Royals: Keeping The Crown

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• Now Playing50minNazi Royals
• Now Playing50minPost-War Amnesia
• Now Playing50minBreaking Tradition
• Now Playing50minRebel Princess
• Now Playing50minThe Pursuit of Normal

Scanning The Nile

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• Now Playing53minLost Routes To The Pyramids
• Now Playing51minTraces Of The Pharaohs Of Luxor
• Now Playing53minMaterials Convoys: A Pharaonic Task

Science In Archaeology 3.0

• Now Playing51minMaking Objects Speak
• Now Playing53minMaking The Dead Speak
• Now Playing51minMaking Sites Speak
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Sea Hunters

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• Now Playing20minOrcas vs. Humpback
• Now Playing20minSea Lions vs. Orcas
• Now Playing20minDolphins and Gannets
• Now Playing20minSeals vs. Hyennas
• Now Playing20minWhales vs. Gulls

Secret Lifes of Sharks

• Now Playing14minGreat White Shark
• Now Playing12minHammerhead Shark
• Now Playing15minTiger Shark

Silly Sustainability

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• Now Playing15minCardboard Lumber Part 1
• Now Playing20minCardboard Lumber Part 2

Space Greed

• Now Playing11minDeclaring Martian Law
• Now Playing12minSol Ownership: Can a Corporation Own The Sun?
• Now Playing11minTerraforming: Can We Build a Planet B?
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• Now Playing12minLooting the Moon For Trillions of Dollars
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• Now Playing11minEndangered Aliens: Will Humans Trash Space?
• Now Playing12minSpace Cowboys: Who Will Wrangle Asteroids and Save The Earth?
• Now Playing13minArming Space Force
• Now Playing11minAbove the Law
• Now Playing12minToxic Space Factories
• Now Playing12minSuing Our Way to Space
• Now Playing15minWill Satellites Help Us Save or Exploit Earth?
• Now Playing12minSpace Pirates
• Now Playing11minMad Scientists in Outer Space
• Now Playing12minSpace as a Tax Haven
• Now Playing15minGoing So Fast Time Slows Down
• Now Playing14minSpace & Shelter
• Now Playing13minWorld Wide Wifi
• Now Playing14minStrange Space Recipes

Space Phenomena

• Now Playing49minAlien Planets
• Now Playing48minBlack Holes

Space Probes!

• Now Playing53minInner Planets
• Now Playing53minOuter Planets
• Now Playing30minVoyager: The Grand Tour
• Now Playing26minCassini and The Crown Jewel
• Now Playing27minRed Rovers
• Now Playing23minPluto's Heart
• Now Playing20minOur Inner Circles of Hell
• Now Playing24minFuture Missions

Speed

• Now Playing50minAcross Oceans
• Now Playing53minAcross Continents
• Now Playing54minInto the Skies
• Now Playing54minInto Space

Stephen Hawking's Favorite Places

• Now Playing27minPart 1
• Now Playing28minPart 2
• Now Playing28minPart 3

Suppressed Science

• Now Playing26minMerging Man & Machine
• Now Playing26minThe Suppressed Science Of Psychedelics
• Now Playing25minRace: Science, Social Construct, or Both?
• Now Playing24minWeather Control: The Debate Over Geo-Engineering
• Now Playing23minWeather Control: The Debate Over Geo-Engineering
• Now Playing22minGenetic Editing
• Now Playing22minAlternative Energy Sources
• Now Playing22minTheories Of Everything

Tech Toys, Part 1

• Now Playing26minTechploration
• Now Playing26minFuture Now
• Now Playing23minTransport And Design
• Now Playing23minInnovation Lift Off
• Now Playing23minDesign Inspired
• Now Playing23minMultilevel Mobility
• Now Playing23minTransport Tech
• Now Playing23minEdge Of Elevation
• Now Playing23minShutter Speed
• Now Playing23minMachines In Motion
• Now Playing23minSpeed Of Sound
• Now Playing23min4 Wheels Of Wonder
• Now Playing23minReady, Set, Go
• Now Playing23minFace Of Innovation
• Now Playing23minSky's The Limit
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• Now Playing23minElectric Revolution
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• Now Playing23minElectrified
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• Now Playing23minSpeed + Efficiently
• Now Playing23minForm Meets Function
• Now Playing23minTomorrow's Transport
• Now Playing23minThe Innovation Game

Tech Toys, Part 2

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• Now Playing23minTechnology Refueled
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• Now Playing23minSpeed + Sound
• Now Playing23minTransport Inspired
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• Now Playing23minJet Power
• Now Playing23minTilt And Kick
• Now Playing23minFly And Hover
• Now Playing23minTransport + Games
• Now Playing23minTransformation
• Now Playing23minElectrified
• Now Playing23minLand + Sea
• Now Playing23minFlying High
• Now Playing22minRoaming In Technology
• Now Playing22minTwo, Three, Four Wheels
• Now Playing22minSuper Car, Super Bike
• Now Playing22minLand, Sea, And Power
• Now Playing22minThe Future Of Transport
• Now Playing22minSpeed Meets Design
• Now Playing22minDrifting In Style
• Now Playing22minOff Road Power
• Now Playing22minThe Flying Car
• Now Playing22minThe Anatomy Of A Supercar

Terror!

• Now Playing44minThe Hotel: Jerusalem, 1946
• Now Playing45minThe Bar: Algiers, 1956
• Now Playing44minThe Games: Munich 1972
• Now Playing45minThe Station: Bologna, 1980
• Now Playing45minThe Ship: USS Cole, 2000
• Now Playing45minThe Island: Norway, 2011

The History Of Food

• Now Playing30minThe Invention of Cooking
• Now Playing34minThe Agricultural Revolution
• Now Playing34minFermentation, Preservation and Exploration
• Now Playing28minThe Industry of Food
• Now Playing32minThe Future of Food

The History of Home Narrated by Nick Offerman

• Now Playing1hr 3minThe Foundations of Home - Structure and Shelter
• Now Playing54minThe Hall, the Kitchen, the Dining Room, the Living Room
• Now Playing1hr 4minThe Second Story - Private Life

The History Of Home Presents

• Now Playing24minThe Rich & The Royal
• Now Playing25minHearst Castle
• Now Playing24minHampton Court Palace
• Now Playing24minMonticello

The Humboldt Current

• Now Playing52minGenesis
• Now Playing52minRenewal
• Now Playing52minArrival

The Lightbulb Moment

• Now Playing22minLike Button: The Unintended Consequences Of The Facebook Like Button
• Now Playing25minCubicle: How The Cubicle Became Universally Hated
• Now Playing23minBarcode: How The Barcode Shaped Our Modern Economy
• Now Playing25minFlorida: How Real Estate Rogues Invented Florida As We Know It
• Now Playing23minMauve: The Fake Color That Made Our Modern World
• Now Playing24minVanilla: The Bean That Shaped The Future Of Food
• Now Playing24minWi-Fi: The Hollywood Actress Who Laid The Groundwork For Wi-Fi
• Now Playing24minStreaming: The Invention That Revolutionized Streaming Video
• Now Playing23minInterstate: How The Interstate Connected And Divided America
• Now Playing28minEdison: How Edison Reinvented Invention

The Secret Lives Of Big Cats

• Now Playing36minThe Secret Lives Of Tigers
• Now Playing27minThe Secret Lives Of Snow Leopards
• Now Playing30minThe Secret Lives Of Pumas
• Now Playing33minThe Secret Lives Of Lions
• Now Playing37minThe Secret Lives Of Leopards
• Now Playing33minThe Secret Lives Of Jaguars
• Now Playing29minThe Secret Lives Of Cheetahs

The Secrets To Civilization

• Now Playing52minBronze Age Catastrophe
• Now Playing52minCities And Empires
• Now Playing53minEmpire And Epidemics

The Tracker's Diary: Bears Of Katmai

• Now Playing28minThe Last Frontier
• Now Playing22minFish Like a Bear
• Now Playing24minA Working Ecosystem
• Now Playing25minThe Wolf and The Storm
• Now Playing25minNeighbors, Old and New
• Now Playing22minNo Place Like Home

The Vikings

• Now Playing46minOrigin of the Vikings
• Now Playing45minEarly Viking Society and Religion
• Now Playing45minThe Ships of the Vikings
• Now Playing45minWeapons of the Vikings

The World Of Bridges

• Now Playing27minChina
• Now Playing27minWales
• Now Playing27minIndia
• Now Playing27minZimbabwe

The Year That Rocked The World

• Now Playing53min1977
• Now Playing53min1981
• Now Playing53min1989
• Now Playing53min1997
• Now Playing53min2004

Tycoons

• Now Playing53minUSA
• Now Playing53minRussia
• Now Playing53minChina

Underwater Wonders Of The National Parks

• Now Playing16minDevils Hole
• Now Playing14minMontezuma Well
• Now Playing24minUSS Arizona: Part 1
• Now Playing19minUSS Arizona: Part 2
• Now Playing13minBuck Island
• Now Playing13minLake Mead
• Now Playing12minYellowstone

Underworld

• Now Playing53minGreat Britain
• Now Playing53minGibraltar
• Now Playing53minSlovenia
• Now Playing53minBelize
• Now Playing53minChina

What Went Wrong?

• Now Playing47minThe Grenfell Tower Fire
• Now Playing49minThe Challenger Shuttle Disaster
• Now Playing47minThe Concorde Air Crash
• Now Playing46minThe Disappearance Of Malaysia Airlines MH370

Specials, Part 1

• Now Playing24min2023: A Space Odyssey
• Now Playing25minAI Tipping Point
• Now Playing20minAmerica's World War I Centennial
• Now Playing1hr 16minAsteroids: The Source Of Life?
• Now Playing34minAttack Of The Zombie Fungus
• Now Playing1hr 33minBessie Coleman: Queen Of The Skies
• Now Playing30minBirth Of The Solar System
• Now Playing30minConscious Capitalism
• Now Playing19minCooking The Ultimate Steak
• Now Playing38minCornfield Shipwreck
• Now Playing36minDebugged
• Now Playing52minDestination: Pluto Beyond The Flyby
• Now Playing45minEclipse: Science And Awe
• Now Playing10minEvolution Of Exercise
• Now Playing42minFighting For Lincoln: The Wide Awakes
• Now Playing1hr 30minGoing Circular
• Now Playing18minHenry V: Leader For The Ages
• Now Playing1hr 47minHeval
• Now Playing23minInfinite Rainbows
• Now Playing19minJason Silva: The Road To The Singularity
• Now Playing41minJFK: Fact & Fable
• Now Playing51minLions Rule
• Now Playing49minLittle Cats
• Now Playing60minLiving With Lions

Specials, Part 2

• Now Playing18minMars: The Journey
• Now Playing46minMathemagics
• Now Playing51minMeet The Mustelids
• Now Playing28minMIA: Hunt For A WWII Plane
• Now Playing51minMiniverse
• Now Playing25minNever Home Alone: The Wildlife Of Kitchens, Bathrooms, And Beyond
• Now Playing24minOperation Lusty: Hunt For The First Nazi Jet
• Now Playing19minOur Violent Sun
• Now Playing53minPeru: Sacrifices In The Kingdom Of Chimor
• Now Playing52minPompeii: Buried Secrets Of The Villa Giuliana
• Now Playing53minPrehistoric Worlds
• Now Playing44minPutin And The Oligarchs
• Now Playing53minPyramids Builders: New Clues
• Now Playing21minRapidly Evolving Human With Spencer Wells
• Now Playing1hr 32minRed Elvis: The Cold War Cowboy
• Now Playing53minRescued Chimpanzees Of The Congo With Jane Goodall Special
• Now Playing51minReturn To The Moon
• Now Playing53minSagrada Familia: The Gaudi Revolution
• Now Playing56minScanning The Pyramids
• Now Playing23minSchool For Sommelier
• Now Playing49minSeals - Clowns Of The Sea
• Now Playing22minSearch For Earth's Lost Moon
• Now Playing53minSpace Robot Revolution
• Now Playing20minSt. Patrick's Greatest Gift
• Now Playing28minThe Apollo Moon Landings

Specials, Part 3

• Now Playing24minThe Hunt For Dark Matter
• Now Playing25minThe Hunt For The Slave Ship Guerrero
• Now Playing53minThe Last Persian Shah
• Now Playing56minThe Lucy Mission: Origins Of The Solar System
• Now Playing52minThe Mystery Of The Cosquer Cave
• Now Playing53minThe Mystery Of The Giant Birds
• Now Playing52minThe Origami Code: Scientists Uncover The Power Of Folding
• Now Playing16minThe Rise & Fall Of T-Rex
• Now Playing28minThe Rise Of Lincoln
• Now Playing50minThe True Story of Pirates
• Now Playing53minThe Untold Story Of The Vatican
• Now Playing56minTop Science Stories Of 2016
• Now Playing53minTop Science Stories Of 2017
• Now Playing1hr 20minTop Science Stories of 2018
• Now Playing1hr 8minTop Science Stories of 2019
• Now Playing1hr 4minTop Science Stories of 2020
• Now Playing1hr 8minTop Science Stories of 2021
• Now Playing1hr 3minTop Science Stories Of 2022
• Now Playing1hr 2minTop Science Stories Of 2023
• Now Playing53minVikings: The Lost Kingdom
• Now Playing21minViruses: Destruction And Creation
• Now Playing29minWhat Animals See
• Now Playing19minWhat is Reality? with David Eagleman
• Now Playing53minWho Killed The Neanderthal?