Comprehensible input in English

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The number on each thumbnail is its difficulty score out of 100: mostly speaking pace, partly vocabulary load. How it is measured →

88/10010:00Why “probability of 0” does not mean “impossible” | Probabilities of probabilities, part 2B2-C1 · ~8,000 words · very fast3Blue1Brown88/10020:06Glia Are Your Brain's Most Mysterious CellsC1-C2 · ~14,000 words · fastSciShow88/1009:36The Android Tablet ProblemB2-C2 · ~8,000 words · very fastMarques Brownlee88/10026:54Why This Zig-Zag Coast Guard Search Pattern is Actually Genius - Smarter Every Day 268B2-C2 · ~5,000 words · very fastSmarterEveryDay88/10023:33What does a Gong Sound Like when Hit with a 1189mph Baseball? - Smarter Every Day 267B2-C1 · ~5,000 words · very fastSmarterEveryDay88/10042:21I Went Into a Nuclear Plant and It Changed How I Think About Radiation - Smarter Every Day 309B1-C1 · ~5,000 words · very fastSmarterEveryDay88/1007:03Apple Lost the AI RaceB1-B2 · ~5,000 words · very fastMarques Brownlee88/10011:20The Discovery of Bacteria Should Have Been ImpossibleB2-C2 · ~9,000 words · very fastSciShow88/10010:52Oh, wait, actually the best Wordle opener is not “crane”…B2-C2 · ~5,000 words · very fast3Blue1Brown88/10033:20How Disc Golf Discs Are Made (MVP Manufacturing Tour) - Smarter Every Day 301B2-C2 · ~8,000 words · very fastSmarterEveryDay88/10015:41Responding to a Capsized Boat with the U.S. Coast Guard - Smarter Every Day 277B1-C1 · ~4,000 words · very fastSmarterEveryDay88/10025:19I Outsmarted Pro Car ThievesB2-C1 · ~5,000 words · very fastMark Rober88/10026:33Ronaldo vs My Unbeatable Goalie RobotB1-C1 · ~5,000 words · very fastMark Rober88/10023:14Backyard Squirrelympics 3.0- The Summer GamesB2-C1 · ~7,000 words · very fastMark Rober88/10054:45Oil pressure is the only thing keeping an engine aliveB2-C2 · ~8,000 words · very fastTechnology Connections88/10024:20Make math videos! | Summer of Math Exposition announcementB1-C1 · ~5,000 words · very fast3Blue1Brown88/10011:44This Robot Eats Trash #TeamSeasB1-B2 · ~4,000 words · very fastMark Rober88/10020:46Uncovering America's Underwater CityB1-C1 · ~4,000 words · very fastMark Rober88/10053:40How I animate 3Blue1Brown | A Manim demo with Ben SparksB1-C1 · ~5,000 words · very fast3Blue1Brown88/10032:38Smartphone Awards 2025!B1-C1 · ~5,000 words · very fastMarques Brownlee88/10016:21iPhone Air Review: Beauty is PainB2-C1 · ~5,000 words · very fastMarques Brownlee88/10035:28Bullets HITTING Bullets in Slow Motion - THE IMPOSSIBLE SHOT - Smarter Every Day 287B1-C1 · ~5,000 words · very fastSmarterEveryDay88/10029:56Why Jet Boats are AWESOME (U.S. Coast Guard's Workhorse) - Smarter Every Day 272B2-C1 · ~5,000 words · very fastSmarterEveryDay88/1001:46:08Refueling a NUCLEAR REACTOR - Smarter Every Day 311B2-C1 · ~5,000 words · very fastSmarterEveryDay

Which English channel to start with

Ranked by median difficulty, easiest first. The bar is a range, not a label — a channel typically spans a wide stretch of the scale, so one level would be false for its own hardest videos.

6 of these 7 channels carry the same vocabulary band (B1-B2), and their scores still run from 0 to 88. That gap is pace: what separates the easiest of these channels from the hardest is how fast people talk, not which words they use. How that is measured →