Retainit

Quizzes for the best explainers on YouTube.

Test what actually stuck from the videos you love — linear algebra with 3Blue1Brown, disasters with fern, physics with Veritasium. Pick a creator and play.

101 quizzes33 creators892 questions
3Blue1Brown3Blue1Brown19 quizzes
But what is the Central Limit Theorem?
But what is the Central Limit Theorem?
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Vectors | Chapter 1, Essence of linear algebra
Vectors | Chapter 1, Essence of linear algebra
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Vectors | Chapter 1, Essence of linear algebra
Vectors | Chapter 1, Essence of linear algebra
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Matrix multiplication as composition | Chapter 4, Essence of linear algebra
Matrix multiplication as composition | Chapter 4, Essence of linear algebra
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Inverse matrices, column space and null space | Chapter 7, Essence of linear algebra
Inverse matrices, column space and null space | Chapter 7, Essence of linear algebra
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Nonsquare matrices as transformations between dimensions | Chapter 8, Essence of linear algebra
Nonsquare matrices as transformations between dimensions | Chapter 8, Essence of linear algebra
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Change of basis | Chapter 13, Essence of linear algebra
Change of basis | Chapter 13, Essence of linear algebra
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Dot products and duality | Chapter 9, Essence of linear algebra
Dot products and duality | Chapter 9, Essence of linear algebra
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Cross products | Chapter 10, Essence of linear algebra
Cross products | Chapter 10, Essence of linear algebra
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A quick trick for computing eigenvalues | Chapter 15, Essence of linear algebra
A quick trick for computing eigenvalues | Chapter 15, Essence of linear algebra
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Abstract vector spaces | Chapter 16, Essence of linear algebra
Abstract vector spaces | Chapter 16, Essence of linear algebra
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How secure is 256 bit security?
How secure is 256 bit security?
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Vectors | Chapter 1, Essence of linear algebra
Vectors | Chapter 1, Essence of linear algebra
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Linear combinations, span, and basis vectors | Chapter 2, Essence of linear algebra
Linear combinations, span, and basis vectors | Chapter 2, Essence of linear algebra
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Linear transformations and matrices | Chapter 3, Essence of linear algebra
Linear transformations and matrices | Chapter 3, Essence of linear algebra
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Cramer's rule, explained geometrically | Chapter 12, Essence of linear algebra
Cramer's rule, explained geometrically | Chapter 12, Essence of linear algebra
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Eigenvectors and eigenvalues | Chapter 14, Essence of linear algebra
Eigenvectors and eigenvalues | Chapter 14, Essence of linear algebra
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The determinant | Chapter 6, Essence of linear algebra
The determinant | Chapter 6, Essence of linear algebra
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Cross products in the light of linear transformations | Chapter 11, Essence of linear algebra
Cross products in the light of linear transformations | Chapter 11, Essence of linear algebra
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VeritasiumVeritasium13 quizzes
Inside The Navy's Indoor Ocean
Inside The Navy's Indoor Ocean
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How Quantum Computers Break The Internet... Starting Now
How Quantum Computers Break The Internet... Starting Now
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What Does IQ Actually Measure?
What Does IQ Actually Measure?
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Would You Take This Bet?
Would You Take This Bet?
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Something Strange Happens When You Trust Quantum Mechanics
Something Strange Happens When You Trust Quantum Mechanics
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The Obviously True Theorem No One Can Prove
The Obviously True Theorem No One Can Prove
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This Particle Breaks Time Symmetry
This Particle Breaks Time Symmetry
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The Man Who Almost Broke Math (And Himself...)
The Man Who Almost Broke Math (And Himself...)
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The Biggest Misconception in Physics
The Biggest Misconception in Physics
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The Most Dangerous Building in Manhattan
The Most Dangerous Building in Manhattan
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The Biggest Misconception in Football (ft. Tom Brady)
The Biggest Misconception in Football (ft. Tom Brady)
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The Perfect Battery Material Is Dangerous
The Perfect Battery Material Is Dangerous
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This mechanism shrinks when pulled
This mechanism shrinks when pulled
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Big ThinkBig Think12 quizzes
Rewire your brain for greater emotional intelligence | Cassandra Worthy
Rewire your brain for greater emotional intelligence | Cassandra Worthy
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The intelligence explosion: Nick Bostrom on the future of AI
The intelligence explosion: Nick Bostrom on the future of AI
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Social media addiction - how it changes your brain | Luke Burgis | Big Think
Social media addiction - how it changes your brain | Luke Burgis | Big Think
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Debunking gender pay gap myths | Richard Reeves
Debunking gender pay gap myths | Richard Reeves
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Debunking success myths | Neil deGrasse Tyson, Michio Kaku & more
Debunking success myths | Neil deGrasse Tyson, Michio Kaku & more
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Do less, become happier, says Yale cognitive scientist | Laurie Santos
Do less, become happier, says Yale cognitive scientist | Laurie Santos
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Good sex explained in 9 minutes | Dr. Emily Nagoski
Good sex explained in 9 minutes | Dr. Emily Nagoski
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Why psychopaths rise to power | Brian Klaas
Why psychopaths rise to power | Brian Klaas
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Debate world champion explains how to argue | Bo Seo
Debate world champion explains how to argue | Bo Seo
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Harvard professor debunks the ‘10,000 steps per day’ myth | Daniel Lieberman
Harvard professor debunks the ‘10,000 steps per day’ myth | Daniel Lieberman
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The #1 way to strengthen your mind is to use your body | Wendy Suzuki
The #1 way to strengthen your mind is to use your body | Wendy Suzuki
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Everyone needs this one skill | Tiago Forte
Everyone needs this one skill | Tiago Forte
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fernfern11 quizzes
How the CIA Stole a Russian Submarine
How the CIA Stole a Russian Submarine
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The Kids Who Hacked The CIA
The Kids Who Hacked The CIA
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The Most Secret Building in Manhattan
The Most Secret Building in Manhattan
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The Hunt for El Chapo
The Hunt for El Chapo
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The $2.1 Billion McDonald's Machine
The $2.1 Billion McDonald's Machine
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The Genius Design of Narco Submarines
The Genius Design of Narco Submarines
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The Kids Who Hacked The CIA
The Kids Who Hacked The CIA
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The Hunt for the King of the Dark Web
The Hunt for the King of the Dark Web
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The Kids Who Hacked Xbox
The Kids Who Hacked Xbox
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The Indian Genius Nobody Understands
The Indian Genius Nobody Understands
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The Largest Weapon Ever Built
The Largest Weapon Ever Built
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Mentour PilotMentour Pilot10 quizzes
This One Made Me CRY! The Incredible story of United Airlines flight 1175
This One Made Me CRY! The Incredible story of United Airlines flight 1175
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"Exit That Runway IMMEDIATELY!" | 7 Seconds From Impact?!
"Exit That Runway IMMEDIATELY!" | 7 Seconds From Impact?!
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We Must Land NOW!! The Incredible Story of Singapore Airlines Flight 319
We Must Land NOW!! The Incredible Story of Singapore Airlines Flight 319
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The Stupidest Airplane Accident Ever? Ethiopian flight 961
The Stupidest Airplane Accident Ever? Ethiopian flight 961
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Pilot GONE with Captain Locked OUTSIDE!!
Pilot GONE with Captain Locked OUTSIDE!!
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Airbus A320 takes off the WRONG way! Air Arabia flight 111
Airbus A320 takes off the WRONG way! Air Arabia flight 111
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How Did EVERYONE Miss THIS!? | Malaysian Airlines Flight 134
How Did EVERYONE Miss THIS!? | Malaysian Airlines Flight 134
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One of the Most AMAZING Aviation Stories EVER told! | TACA flight 110
One of the Most AMAZING Aviation Stories EVER told! | TACA flight 110
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"Pods" under the wing? What are they?
"Pods" under the wing? What are they?
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Why are the Boeing 737NG engines FLAT?
Why are the Boeing 737NG engines FLAT?
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MediumMedium3 quizzes
5 libraries that help improve UX in your React Native application.
5 libraries that help improve UX in your React Native application.
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5 libraries that help improve UX in your React Native application.
5 libraries that help improve UX in your React Native application.
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5 libraries that help improve UX in your React Native application.
5 libraries that help improve UX in your React Native application.
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Dwarkesh PatelDwarkesh Patel3 quizzes
Carl Shulman (Pt 1) - Intelligence Explosion, Primate Evolution, Robot Doublings, & Alignment
Carl Shulman (Pt 1) - Intelligence Explosion, Primate Evolution, Robot Doublings, & Alignment
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Richard Rhodes - Making of Atomic Bomb, WW2, Oppenheimer, AI, & Apocalypse
Richard Rhodes - Making of Atomic Bomb, WW2, Oppenheimer, AI, & Apocalypse
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Richard Rhodes - Making of Atomic Bomb, WW2, Oppenheimer, AI, & Apocalypse
Richard Rhodes - Making of Atomic Bomb, WW2, Oppenheimer, AI, & Apocalypse
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AppleApple2 quizzes
Belkin iPhone Mount with MagSafe for Mac Notebooks
Belkin iPhone Mount with MagSafe for Mac Notebooks
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Customize your 16‑inch MacBook Pro - Space Gray
Customize your 16‑inch MacBook Pro - Space Gray
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Steve MouldSteve Mould2 quizzes
The Assassin's Teapot Is Weird
The Assassin's Teapot Is Weird
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How petrol pumps know when to turn themselves off
How petrol pumps know when to turn themselves off
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Marginal Revolution UniversityMarginal Revolution University2 quizzes
The Supply Curve
The Supply Curve
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Introduction to Economics | Marginal Revolution University (MRU)
Introduction to Economics | Marginal Revolution University (MRU)
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The School of LifeThe School of Life2 quizzes
Reparenting Our Inner Child
Reparenting Our Inner Child
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How To Simplify Your Life
How To Simplify Your Life
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www.irish-genealogy-toolkit.comwww.irish-genealogy-toolkit.com1 quiz
Coffin ships: death and pestilence on the Atlantic
Coffin ships: death and pestilence on the Atlantic
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Lex ClipsLex Clips1 quiz
How to become smarter: Is it possible? | Richard Haier and Lex Fridman
How to become smarter: Is it possible? | Richard Haier and Lex Fridman
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www.flipspaces.comwww.flipspaces.com1 quiz
Redefining Interior Design and Furniture and Furnishing retail through technology
Redefining Interior Design and Furniture and Furnishing retail through technology
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Wall Street JournalWall Street Journal1 quiz
Spotify Breaks Down the Mapping Tech Behind Its Algorithm | The Tech Behind | WSJ
Spotify Breaks Down the Mapping Tech Behind Its Algorithm | The Tech Behind | WSJ
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Scott YoungScott Young1 quiz
Finish Work Faster by Copying How Olympic Athletes Train
Finish Work Faster by Copying How Olympic Athletes Train
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Economic Matters with Subodh MathurEconomic Matters with Subodh Mathur1 quiz
Vidped 116 Ashish Kulkarni India How to get interested in econ and learning Aug 2023
Vidped 116 Ashish Kulkarni India How to get interested in econ and learning Aug 2023
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Bloomberg OriginalsBloomberg Originals1 quiz
How to Get Into Silicon Valley’s $600 Billion Startup School | The Circuit with Emily Chang
How to Get Into Silicon Valley’s $600 Billion Startup School | The Circuit with Emily Chang
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Joel CreatesJoel Creates1 quiz
World's LONGEST zip string spinner!
World's LONGEST zip string spinner!
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Two Minute PapersTwo Minute Papers1 quiz
AI Mind Reading Experiment!
AI Mind Reading Experiment!
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Wendover ProductionsWendover Productions1 quiz
How Amazon's Super-Complex Shipping System Works
How Amazon's Super-Complex Shipping System Works
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AcquiredAcquired1 quiz
Hermès (Acquired): A Memory Game
Hermès (Acquired): A Memory Game
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UnclassifiedUnclassified1 quiz
Every Generation of Fighter Jets Explained
Every Generation of Fighter Jets Explained
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MediumMedium1 quiz
Docker Networking Model — Introduction
Docker Networking Model — Introduction
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VoxVox1 quiz
Why fixing the US bail system is tricky
Why fixing the US bail system is tricky
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Harvard Business ReviewHarvard Business Review1 quiz
A Plan Is Not a Strategy
A Plan Is Not a Strategy
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www.safariinuae.comwww.safariinuae.com1 quiz
Ferrari World - Bronze Ticket
Ferrari World - Bronze Ticket
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Apple ExplainedApple Explained1 quiz
How Steve Jobs Started PIXAR
How Steve Jobs Started PIXAR
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TEDTED1 quiz
The Inside Story of ChatGPT’s Astonishing Potential | Greg Brockman | TED
The Inside Story of ChatGPT’s Astonishing Potential | Greg Brockman | TED
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Quanta MagazineQuanta Magazine1 quiz
The Riemann Hypothesis, Explained
The Riemann Hypothesis, Explained
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Lenny's PodcastLenny's Podcast1 quiz
Velocity over everything: How Ramp became the fastest-growing SaaS startup ever | Geoff Charles
Velocity over everything: How Ramp became the fastest-growing SaaS startup ever | Geoff Charles
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Darren Chai, MDDarren Chai, MD1 quiz
How I got a 4.0 GPA with COGNITIVE LOADING (Better than Active Recall)
How I got a 4.0 GPA with COGNITIVE LOADING (Better than Active Recall)
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Matt MocharyMatt Mochary1 quiz
Effective Communication - Heard: How to Get It From Others
Effective Communication - Heard: How to Get It From Others
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