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- Now Playing11minThe Hazy Evolution of Cannabis
- Now Playing11minMeasuring the Universe With a 14-Billion Light-Year Ruler
- Now Playing16minHow Eclipses Revealed Our Solar System
- Now Playing10minA Giant Monster With a Giant Problem
- Now Playing10minWhat Will Earth Be Like 300 Million Years From Now?
- Now Playing16minWhat If Gravity is Not A Fundamental Force?
- Now Playing15minDoes Space Emerge From A Holographic Boundary?
- Now Playing8minIs the Southern Accent Disappearing?
- Now Playing15minThis Winter Trend Is Overpowering Global Warming
- Now Playing8minWhat Was The Earliest Surgery?
It's Okay to Be Smart
- Now Playing10minThe Impossible Hugeness of Deep Time
- Now Playing6minYour Climate Conscience - feat. Al Gore
- Now Playing6minThe Largest River On Earth Is In The Sky
- Now Playing4minThere's Science Hidden In Our National Monuments
- Now Playing6minWhy It Is What Time It Is (The History of Time)
- Now Playing6minWhat Are Rainbows?
- Now Playing7minWe Got Ants In Our Plants!
- Now Playing12minEvolution FAILS in the Human Body
- Now Playing7minWhy Don't Woodpeckers Get Concussions?
- Now Playing3minDoes The Moon Really Orbit The Earth?
- Now Playing6minDefusing the Population Bomb
- Now Playing8minEbola Explained
- Now Playing6minThe REAL Physics of Hot Air Balloons!
- Now Playing7minZombie Parasites!
- Now Playing5minShould You Eat Everyday?
- Now Playing2minWhy Are There Still Monkeys? - 12 Days of Evolution #10
- Now Playing3minWhat is Wind?
- Now Playing9minWhat Color Is A Banana?
- Now Playing7minWhy Are We The Only Humans Left?
- Now Playing6minHow the Toilet Changed History
Origin of Everything
- Now Playing12minSix Historically True Facts about Money
- Now Playing8minWhy Do People Have Pets?
- Now Playing6minWhy Do We Have Middle Names?
- Now Playing11minWhat is Racial Passing?
- Now Playing12minWhy Do We Have Housing Projects?
- Now Playing8minWhy Do We Eat Artificial Flavors?
- Now Playing10minWhat is Ethnicity?
- Now Playing9minWhy Do We Drink Milk in School?
- Now Playing8minWhy Do We Get Grades in School?
- Now Playing7minWhy Does Santa Wear Red?
- Now Playing9minThe Origin of Gender
- Now Playing8minWhy Did Europeans Enslave Africans?
- Now Playing7minThe True Origin of Killer Clowns
- Now Playing8minWhere does the Nuclear Family Come From?
- Now Playing9minWhy Do All Malls Look the Same?
- Now Playing9minThe Origin of Gender
- Now Playing7minWhy Do We Eat Popcorn at The Movies?
- Now Playing10minWhy Do We Have Hobbies?
- Now Playing11minWhy Do So Many Religions Have Headwear?
- Now Playing10minThe 2nd Amendment Explained
Two Cents
- Now Playing8min5 Ways People Are Dumb About Money
- Now Playing6minHow Do You Actually Buy A House?
- Now Playing6minShould I Buy Bitcoin?
- Now Playing6minWhat is The Cost of Pet Ownership?
- Now Playing8minAre "Free" Video Games Really Free?
- Now Playing6minWhat the Heck Are Mutual Funds?
- Now Playing6minDoes Wealth Make You Meaner?
- Now Playing6minThe Ugly Truth About Airline Miles
- Now Playing6minShould You Break Up With Your Big Bank?
- Now Playing4minWhat is the DOW?
- Now Playing7minIs the Stock Market Just a Big Casino?
- Now Playing5minBudgeting Basics
- Now Playing8min5 Strange Investor Crazes!
- Now Playing5minHow are credit scores calculated?
- Now Playing5minHow Do Your Tax Dollars Get Spent?
- Now Playing7minLove and Money
- Now Playing7minIs It Even POSSIBLE to Save for Retirement?
- Now Playing6minDo I Need To Buy A House?
- Now Playing6minHacking Your Brain to Get Out Of Debt
- Now Playing6minWhat Are The Most Lucrative Trades?
Monstrum
- Now Playing14minThe Evolution of Creepy Dolls
- Now Playing8minNuckelavee: Scotland's Skinless Evil Monstrosity
- Now Playing11minThe Fatal Song of the Sirens
- Now Playing12minWas Púca the Nightmare Bunny That Inspired Donnie Darko?
- Now Playing8minCreepy Clowns: The Horror Behind the Laughter
- Now Playing6minRethinking Frankenstein's Monster
- Now Playing11minThe Original Urban Legend: Spring-Heeled Jack
- Now Playing10minWill-o'-the-Wisp: Monstrous Flame or Scientific Phenomenon?
- Now Playing6minThe Origin of Medusa
- Now Playing11minBasilisk or Cockatrice? The Mysterious King of Serpents
- Now Playing10minJorōgumo: The Deadly Spider Woman from Yokai Lore
- Now Playing13minThe SCP Foundation: Declassified
- Now Playing15minBaba Yaga: The Ancient Origins of the Famous 'Witch'
- Now Playing8minWerehyena: The Terrifying Shapeshifters of African Lore
- Now Playing12minDeath Worms: Fact or Fiction?
- Now Playing13minWhat Happened During Our Scary Slumber Party
- Now Playing10minYara-ma-yha-who: Australia's Regurgitating, Blood-Sucking Mo
- Now Playing10minThe Enchanting Fairies of Celtic Lore
- Now Playing10minPontianak: The Vampiric Ghost of Southeast Asia
- Now Playing11minCan All Monsters Be Traced Back to Tiamat?
Eons
- Now Playing12minWhen We Tamed Fire
- Now Playing8minThe Extinction That Never Happened
- Now Playing10minWhen Fish Wore Armor
- Now Playing9minWhen Fish First Breathed Air
- Now Playing11minWhat Happened to the World's Greatest Ape?
- Now Playing10minWhy The Giraffe Got Its Neck
- Now Playing10minWhen Giant Amphibians Reigned
- Now Playing9minWhen Plants Doubled Their DNA
- Now Playing10minHow Whale Evolution Kind Of Sucked
- Now Playing9minThe Island of the Last Surviving Mammoths
- Now Playing10minThe Missing Link That Wasn't
- Now Playing8minWe Were Wrong About The Dodo
- Now Playing8minWhen the Sahara Was Green
- Now Playing8minPrimates vs Snakes (An Evolutionary Arms Race)
- Now Playing9minHow the Turtle Got Its Shell
- Now Playing9minWhat a Dinosaur Looks Like Under a Microscope
- Now Playing11minWhen the Synapsids Struck Back
- Now Playing10minYou're Living On An Ant Planet
- Now Playing8minThe Risky Paleo Diets of Our Ancestors
- Now Playing8minWhy Sour May Be The Oldest Taste
Hot Mess
- Now Playing5minWe've Ignored Climate Change For More Than a Century
- Now Playing5minBeef Is Bad For The Climate. Can We Make It Better?
- Now Playing5minWhat the Cutest Animal Can Teach Us About Saving Ourselves
- Now Playing6minWhat if Carbon Emissions Stopped Tomorrow?
- Now Playing5minHow A Sticker Kept 3 Billion Tons of CO2 Out of The Air
- Now Playing5minWhat Can You Actually Do About Climate Change?
- Now Playing5minWhat's actually the worst greenhouse gas?
- Now Playing5minWhat the Cutest Animal Can Teach Us About Saving Ourselves
- Now Playing4minWhy Are Hurricanes Getting Stronger?
- Now Playing5minWe've Ignored Climate Change For More Than a Century
- Now Playing5minClimate change will push millions out. Where will they go?
- Now Playing6minWhat if Carbon Emissions Stopped Tomorrow?
- Now Playing5minBeef Is Bad For The Climate. Can We Make It Better?
- Now Playing11minClimate Change is Too Big for our Brains feat. Mike Rugnetta
- Now Playing6minWhat Indigenous Communities Teach Us About Climate Change
- Now Playing7minHow To Make Clothes Less Terrible for the Planet
- Now Playing5minHow A Sticker Kept 3 Billion Tons of CO2 Out of The Air
- Now Playing9minHow to Talk About Climate Change
- Now Playing8minHow One Conservative Texas Town Went 100% Renewable
- Now Playing3minCould climate change make you allergic to meat?
Space Time
- Now Playing9minCan a Circle Be a Straight Line?
- Now Playing15minDeep Time: Crash Course Astronomy #45
- Now Playing7minHow to Signal Aliens
- Now Playing14minAre Dark Matter And Dark Energy The Same?
- Now Playing14minThe Big Bang, Cosmology part 1: Crash Course Astronomy #42
- Now Playing14minIs The Wave Function The Building Block of Reality?
- Now Playing12minThe Alchemy of Neutron Star Collisions
- Now Playing11minNo Dark Matter = Proof of Dark Matter?
- Now Playing11minHow Cosmic Inflation Flattened the Universe
- Now Playing11minWhy is the Earth Round and the Milky Way Flat?
- Now Playing11minMartian Evolution
- Now Playing12minSolving the Impossible in Quantum Field Theory
- Now Playing12minHow Do We Know What Stars Are Made Of?
- Now Playing14minCould the Higgs Boson Lead Us to Dark Matter?
- Now Playing11minFirst Detection of Life
- Now Playing13minAre We Living in an Ancestor Simulation? ft. Neil deGrasse T
- Now Playing10minZero-Point Energy Demystified
- Now Playing9minIs There a Fifth Fundamental Force? + Quantum Eraser Answer
- Now Playing16minWas the Gravitational Wave Background Finally Discovered?!?
- Now Playing10minTelescopes of Tomorrow
Beat Making Lab
- Now Playing3minBeat Making Challenge #1: Accordion Trap
- Now Playing5minBehind the Beat: Portobelo
- Now Playing2minWhat's In the Backpack?
- Now Playing3minPanama: Meet the Kids Behind the Beats
- Now Playing3minGet Your Drums Right
- Now Playing2minField Trip: Prison Beats
- Now Playing2minMashup: National Anthems
- Now Playing10minHeartbeats of Fiji
- Now Playing4minCho Cho Cho (Music Video) filmed in Goma, Congo
- Now Playing2minWalshy Fire [of Major Lazer] Wants Your Riddims
- Now Playing3minEpisode 1: Goma, Congo
- Now Playing4minDiablos (music video)
- Now Playing3minExclusive Zenga (Music Video) by Flamme Kapaya
- Now Playing3minBeat Making Challenge #2: Kora Riddim
- Now Playing3minFemale Hip Hop Crew Makes Beats in Senegal
- Now Playing3minProf. Angel Sound Prison Beats Interview
- Now Playing3min#FijiChallenge w/ Walshy Fire of Major Lazer
- Now Playing4minPortobelo (music video)
- Now Playing3minBehind The Beat: First Beat Making Lab (2011)
- Now Playing3minSampling w/ Flip Flops and Ski Beatz
Infinite Series
- Now Playing11minCan We Hear Shapes?
- Now Playing14minWhy Computers are Bad at Algebra
- Now Playing11minWhat are Numbers Made of?
- Now Playing14minInfinite Chess
- Now Playing11minCan We Hear Shapes?
- Now Playing14minCan We Combine pi & e to Make a Rational Number?
- Now Playing8minThe Multiplication Multiverse
- Now Playing12minHow Infinity Explains the Finite
- Now Playing8minA Breakthrough in Higher Dimensional Spheres
- Now Playing14minSolving the Wolverine Problem with Graph Coloring
- Now Playing10minInstant Insanity Puzzle
- Now Playing9minAssociahedra: The Shapes of Multiplication
- Now Playing14minTopology Riddles | Infinite Series
- Now Playing8minAre Prime Numbers Made Up?
- Now Playing14minMaking Probability Mathematical
- Now Playing9minProving Brouwer's Fixed Point Theorem
- Now Playing13minNetwork Mathematics and Rival Factions | Infinite Series
- Now Playing11minTopology vs "a" Topology
- Now Playing11minVoting Systems and the Condorcet Paradox
- Now Playing12minProving Pick's Theorem
Idea Channel
- Now Playing4minThe Bronies Phenomenon
- Now Playing3minAn Interview with Minecraft EDU Creator Joel Levin
- Now Playing9minIs a DOS Attack a Weapon?
- Now Playing6minShould "Happy Birthday" be Protected by Copyright?
- Now Playing6minIs Doctor Who a Religion?
- Now Playing5minThere's No Such Thing as Online?!?
- Now Playing5minA Visit to Mr. Monfre's Class
- Now Playing5minIs Homestuck the Ulysses of the Internet?
- Now Playing6minThe Retro Awesomeness of Adventure Time
- Now Playing5minIs CSS and Website Design a Fashion Statement?
- Now Playing5minAre Olympic Competitors Geniuses?
- Now Playing9minIs the Universe a Computer?
- Now Playing5minHow will the Animated GIF affect the Presidential Election?
- Now Playing4minAre Mashups the End of Music Genres?
- Now Playing8minDo Knock-Offs Prove the Value of a Brand?
- Now Playing9minCan Video Games Become the Next Spectator Sport?
- Now Playing6minWhat Do Santa and Wrestling Have In Common?
- Now Playing5minIs Facebook Changing Our Identity?
- Now Playing6minWhat do MP3s and Magic Spells Have in Common?
- Now Playing4minFrom Sherlock Holmes to 50 Shades of Grey