Data in Motion#05
Car Production: Which Countries and Makers Lead?
The order keeps changing: we follow 8 countries from 1961 to 2025 and the top ten maker groups from 1999 as bars overtake each other.
Data, math and science, checked with videos and hands-on experiments
Watch on YouTube, then try things out here. Every episode page lists all of its sources.
New
Published Oct 26–Oct 28
Scale Side by Side#04
Can Folding Paper 42 Times Really Reach the Moon?
By the thickness math, a 0.1 mm sheet reaches about 440,000 km after 42 folds, beyond the Moon.
Classics in 5 Minutes#08
Kokoro by Natsume Sōseki Summary: What Was Sensei Hiding?
A young man receives a long letter in which Sensei reveals how, years earlier, he and his close friend K loved the same young woman.
Illusion Lab#05
Optical Illusion: Why Do Still Rings Look Like They Move?
The rings look as if they slide or rotate, but they are still images whose coordinates never change.
What If, Calculated#04
Can You Pass a Test by Rolling a Die? 10,000 People and All of Humanity
Yes — 10 of 10,000 dice-only test-takers passed the 20-question test (median of 3 simulation runs).
Classics in 5 Minutes#06
Sangetsuki Summary: What Does the Tiger Ask His Friend?
Li Zheng, who has become a tiger, meets his old friend Yuan Can.
Classics in 5 Minutes#07
What Is Night on the Galactic Railroad About? A 5-Minute Summary
On the night of the star festival, a boy named Giovanni rides a train across the Milky Way with his friend Campanella.
Focus Sound Room#03
Forest Morning Window: Birdsong Sounds for Study & Focus (1 Hour, No Music)
An empty forest window, where the light grows from blue pre-dawn into morning — an hour of birdsong and rustling leaves.
Series
11 series. Each color matches the label on the video thumbnails.
- Illusion Lab See an optical illusion, then check it with your own eyes and a ruler 5 ep.
- Data in Motion World numbers as racing, moving charts 5 ep.
- How It Works Inside What is going on inside everyday machines 3 ep.
- What If, Calculated Taking "what if" seriously, with real math 4 ep.
- Scale Side by Side Sizes, heights and amounts, side by side on one scale 4 ep.
- Maps in Motion Fast-forwarding time on a map 3 ep.
- Classics in 5 Minutes A classic in 5 minutes, and one question checked against the text 8 ep.
- Rewind Factory From the finished product back to the raw materials 3 ep.
- Focus Sound Room One-hour sound rooms for studying and focus 3 ep.
- Math Aha! Theater The "aha!" moment in math, with pictures and motion 2 ep.
- RICOFLUX A block breaker: strike the ball, multiply it, break everything at once 2 ep.
All episodes
42 episodes, newest first
Data in Motion#05
Car Production: Which Countries and Makers Lead?
Scale Side by Side#04
Can Folding Paper 42 Times Really Reach the Moon?
Classics in 5 Minutes#08
Kokoro by Natsume Sōseki Summary: What Was Sensei Hiding?
Illusion Lab#05
Optical Illusion: Why Do Still Rings Look Like They Move?
RICOFLUX#02
RICOFLUX v2.0: Skies of Italy and the Winged Lion
RICOFLUX#01
RICOFLUX v1.0: Skies of Japan and the Dragon of Light
What If, Calculated#04
Can You Pass a Test by Rolling a Die? 10,000 People and All of Humanity
Classics in 5 Minutes#06
Sangetsuki Summary: What Does the Tiger Ask His Friend?
Classics in 5 Minutes#07
What Is Night on the Galactic Railroad About? A 5-Minute Summary
Focus Sound Room#03
Forest Morning Window: Birdsong Sounds for Study & Focus (1 Hour, No Music)
Classics in 5 Minutes#05
Where Does the Thread Snap in The Spider’s Thread?
Rewind Factory#03
What is cellophane tape made from? Rewinding to the raw material
Data in Motion#04
A 17-Year-Old in 1900: Which Grade Today Is Just as Tall? 125 Years of Height
Classics in 5 Minutes#04
Botchan by Natsume Soseki: Can You Name the Hero?
Maps in Motion#03
Why Did the Aral Sea Shrink? Satellite Map Timelapse 2000→2026
Illusion Lab#04
Why Do Parallel Lines Look Tilted? Café Wall & Zöllner Illusions
How It Works Inside#03
How Does a Refrigerator Make Things Cold?
Classics in 5 Minutes#03
The Restaurant of Many Orders: How Many Doors Until You Notice?
Data in Motion#03
Game console sales, 1972–2026: does Japan's ranking match the world's?
Illusion Lab#03
Which Patch Looks Lighter? Shadow & Stripe Optical Illusions, Tested
Scale Side by Side#03
How Much Water Is on Earth? One Ball, from One Liter to the Whole Planet
What If, Calculated#03
What If All 8.3 Billion People Jumped at the Same Time?
How It Works Inside#02
Where Do Escalator Steps Go?
Illusion Lab#02
Which Circle Looks Bigger? The Ebbinghaus Illusion, Tested