| 201. | Amazing Facts About Whales! | 874,538 | |
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| 202. | How Some Animals Engineered Air Conditioning | 864,902 | |
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| 203. | Do You Really Have Two Brains? | 853,598 | |
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| 204. | Why Does Time Go Forward? | 846,617 | |
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| 205. | What If We Could See Nature In Infrared? | 830,955 | |
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| 206. | Why Did We Blow On Nintendo Games? | 828,659 | | Super Mario Bros.
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| 207. | The Equinox Isn't What You Think It Is | 828,181 | |
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| 208. | Photosynthesis Has a Fatal Flaw (and We Can Fix It) | 825,930 | |
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| 209. | We need to talk about scallop eyes 😱 | 822,833 | |
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| 210. | Could You Ever Be Immune To EVERY Disease? Your Immune System, Explained! | 819,436 | |
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| 211. | How Your Body Knows Left From Right | 812,391 | |
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| 212. | This galaxy map is hiding a secret about dark energy | 802,638 | |
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| 213. | Are You Afraid of Holes? | 801,419 | |
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| 214. | Glass is Solid… So Why Is It Clear? | 801,190 | |
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| 215. | Climate change is turning sea turtles FEMALE?! | 792,855 | |
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| 216. | What could we see with a planet-sized telescope? | 789,083 | |
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| 217. | Where Does the Smell of Rain Come From? | 775,164 | |
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| 218. | Sunlight Is Way Older Than You Think. Here’s Why… | 774,295 | |
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| 219. | How Did We Figure Out What Light Is? | 773,801 | |
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| 220. | Camouflage Isn't What It Appears To Be | 769,698 | |
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| 221. | Why trees look like rivers and also blood vessels and also lightning… | 768,448 | |
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| 222. | Why Do We Cry? | 766,028 | |
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| 223. | Explaining Lunar Eclipses and the SUPER BLOOD MOON! | 764,341 | |
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| 224. | Could Bigfoot REALLY Exist? | 763,098 | |
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| 225. | The Science of Rainbows | 761,930 | |
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| 226. | COVID-19 & Mask Myths DEBUNKED! | 751,215 | |
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| 227. | Nature's Most Amazing Animal Superpowers | 747,288 | |
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| 228. | Why Are The Bees Dying? | 743,219 | |
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| 229. | Why Are You Multicellular? | 740,900 | |
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| 230. | Why Don't Birds Lay Square Eggs? | 737,557 | |
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| 231. | What Color is the Universe? | 736,341 | |
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| 232. | How to See Time Travel!!! | 734,283 | Guide |
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| 233. | When Science FICTION Becomes Science FACT! | 733,719 | |
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| 234. | Is This Why We Haven’t Found Alien Civilizations? | STELLAR | 732,414 | |
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| 235. | Ghosts of Evolution | 725,773 | |
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| 236. | The Surprising Species That Everything Else Depends On | IN OUR NATURE | 724,651 | |
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| 237. | How Scientists Made the Hottest Thing Ever | 721,172 | |
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| 238. | Do Other Planets Have Seasons Too? | 719,782 | |
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| 239. | How Do We Know Plate Tectonics Is Real? | 715,861 | |
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| 240. | Why the Heck Are We Ticklish? | 698,919 | |
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| 241. | Ebola Explained | 695,483 | |
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| 242. | This Is Not a Rainbow | 694,938 | |
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| 243. | Banana strings are gross (and also awesome?) | 690,040 | |
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| 244. | Inside an ADORABLE Sea Otter Adoption Program! | 681,542 | |
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| 245. | What Are The Most Important Science Images Ever? | 681,116 | |
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| 246. | How To See Colors That Aren't Real | 675,323 | |
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| 247. | %$?# Allergies! | 674,866 | |
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| 248. | Why the Plastic Pollution Problem Is So Much Worse Than You Think | 672,327 | |
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| 249. | You won't believe how polluted the US was 50 years ago | 672,178 | |
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| 250. | How Hard Is It To Hit a Major League Fastball (According to Science)? | 672,092 | |
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| 251. | Why Your Grandma Is an Evolutionary Mystery (feat. @MamaDoctorJones) | 668,480 | |
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| 252. | Is Big Data Getting Too Big? | 668,411 | |
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| 253. | Why Does Music Move Us? | 662,524 | |
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| 254. | Why You See Faces in Things | 660,465 | |
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| 255. | Space is Full of Junk. Here’s How to Clean It Up… | 654,744 | |
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| 256. | You won’t believe what NASA found in these asteroid samples! | 649,882 | |
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| 257. | The Weird Science of the Raisin Bran Effect | 648,963 | |
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| 258. | The Odds of Finding Life and Love | 644,537 | |
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| 259. | These Death-Eating Scavengers Are Real Life-Savers | IN OUR NATURE | 639,116 | |
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| 260. | Antibiotic Resistance and the Rise of Superbugs | 636,737 | |
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| 261. | Some People Won't Be Able to Listen to This Video | 626,630 | |
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| 262. | There's Proof of Evolution Hiding in Your DNA | 623,297 | |
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| 263. | Could You Be a Chimera? | 622,871 | |
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| 264. | Why Do Birds Fly in a V Formation? | 618,710 | |
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| 265. | Einstein Is (Almost) Always Right: Gravitational Waves Edition | 615,674 | |
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| 266. | How Artist Claude Monet Was Kind Of Like a Honeybee | 613,348 | |
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| 267. | The Mathematical Code Hidden In Nature | 611,453 | |
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| 268. | Unraveling the Great Butterfly Migration Mystery | 605,038 | |
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| 269. | Why Is Glacier Ice Blue? Exploring An ICE CAVE! | 603,327 | |
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| 270. | Using a Bunch of Mousetraps to Explain How Pandemics Work (feat. @theslowmoguys) | 596,419 | |
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| 271. | The Strange Evolutionary Story of the Thylacine | 586,357 | |
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| 272. | Why Getting Dizzy is Kinda Like Temporary Brain Damage | 583,878 | |
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| 273. | Your Microbiome: The Invisible Creatures That Keep You Alive! | 582,523 | |
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| 274. | The Surprising Origins of Thanksgiving Foods | 580,881 | |
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| 275. | Why Hurricanes Are Earth's Most Powerful Storms | 579,631 | |
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| 276. | Why Don't Humans Hibernate? | 573,098 | |
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| 277. | The History of Money (From Barter To Bitcoin) | 570,124 | |
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| 278. | The Science of BBQ!!! | 561,401 | |
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| 279. | The Recipe For Life… | 560,062 | |
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| 280. | How The Elements Got Their Names | 556,279 | |
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| 281. | We've Got Ants In Our Plants! | 554,443 | |
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| 282. | Why Do Things Sound Scary? | 544,600 | |
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| 283. | Extreme Microbes Are Eating The Titanic | 540,714 | |
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| 284. | 97% of Climate Scientists Really Do Agree | 536,540 | |
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| 285. | How Did X Become the Unknown (and so much else)? | 531,180 | |
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| 286. | Is This A NEW SPECIES?! | 530,385 | |
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| 287. | How Every Movie & Video Game Tricks Your Brain | 525,570 | |
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| 288. | This video is half a moment long | 521,983 | |
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| 289. | CHAOS: Why It's So Hard To Predict the Weather | 518,513 | |
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| 290. | Spit: Everything You Never Wanted To Know | 517,543 | |
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| 291. | Can You Crush a Human Using the Atmosphere? | 516,944 | |
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| 292. | Why Deadly Viral Pandemics Are Becoming More Common | 516,400 | |
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| 293. | The Delicious Science of CHEESE! | 516,357 | |
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| 294. | Biomass - How Much Does Life on Earth Weigh? | 511,058 | |
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| 295. | The TRUE Story of Ben Franklin & His Kite | 509,979 | |
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| 296. | This Salamander Can Regrow Limbs Like Deadpool | 505,468 | |
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| 297. | Why We Should Launch Rockets From the Moon | 504,751 | |
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| 298. | What's the Largest Living Thing On Earth? | 502,972 | |
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| 299. | The Mystery of Earth's Disappearing Giants | IN OUR NATURE | 501,070 | |
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| 300. | Why Useless Knowledge Can Be So Useful | 496,612 | |
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