For grown-ups
What Loupio is
- Loupio is a living magnifying glass that opens real things: a bike, a heart, the Moon, a toaster.
- Each thing is a Figure your child drives with their fingers.
- Every number on screen comes from the same formula that moves the parts.
- Your child predicts, breaks and fixes the machine, then measures the real one at home.
- Each Figure files Tricks into a deck, so the same idea shows up in a bike and in the sky.
Ages
Built for ages 7 to 10. Younger children play with a grown-up. "Grown-up numbers" carry 10 to 12 year olds further.
How a Figure works
- Peek: drag Loupio over the closed object to see inside.
- Question: 1 question a child has really asked.
- Play: drive the main part with the real gesture.
- Predict: 3 picture cards before the key step, no score.
- Reveal: the step runs and 1 sentence explains it.
- Break lab: Grain breaks 1 part, a slow replay shows the 1 number that explains it.
- Same trick: the Trick cards fly into the deck and link Figures.
- True or cheat: every shortcut of the drawing, named.
- Mission: measure your own bike, toaster, pulse or Moon.
- Done: the drawing turns to colour and stars show progress.
How sessions end
A session ends by itself after 2 Figures: Bobine closes the workshop. You can open 1 more. No streak, no coins, no notifications.
The scientific contract
- 1 model per Figure. A pure TypeScript module computes every number.
- Unit tests compare each model to hand-computed values.
- Sources for every constant and claim, listed below. Values without a solid source say "model value" or "to verify".
- True or cheat cards name every shortcut: air ignored, atoms drawn big, timings illustrative.
- Review before public launch by a physics teacher and a paediatrician.
- No medical claims. The pulse mission says what is typical and sends any worry to a doctor.
Sources per Figure
FIG. 01 Bike
- Sheldon Brown gear calculator (verified as reference for the gear development method) verified
- Wikipedia, Bicycle tire (ISO 5775: 406 mm for 20 inch kid wheels) verified
- HyperPhysics, inclined plane verified
- Kid bike chainring 32 teeth, crank 140 mm, 35 kg (model values) to verify
FIG. 02 Heart
- Wikipedia, Heart sounds (S1 = middle doors closing, S2 = exit doors closing) verified
- Wikipedia, Sinoatrial node (the heart’s own pacemaker; nerves speed it up or slow it down) verified
- Wikipedia, Chordae tendineae (the heart strings that stop the middle doors flipping back) verified
- Wikipedia, Electrical conduction system of the heart (sinus node, AV node, bundle branches) verified
- MedicineNet, citing the AHA (kid resting heart rate about 70 to 100) (secondary source) to verify
- JEMS, adult cardiac output 70 x 70 mL = 4.9 L/min (verified as a cited formula) verified
- American Heart Association, target heart rates (pulse check method) (page not opened today) to verify
- Model values: walk 110 and run 150 bpm, fill 0.6 T and squeeze 0.4 T, 5 s autopilot time constant (illustrative, simplified) to verify
FIG. 03 Moon
- NASA Earth fact sheet (GM 398,600 km3/s2, mean radius 6,371 km, escape speed 11.186 km/s) verified
- NASA Moon fact sheet (Distance 384,400 km, mean orbital speed 1.022 km/s, sidereal period 27.3217 days. Our circle gives 1.018 km/s and 27.45 days: it ignores the Moon’s own mass and its slightly oval path.) verified
- Wikipedia, Newton’s cannonball verified
- Space station height about 400 km and lap about 92 minutes (To source from NASA before launch.) to verify
- NASA Moon fact sheet: synodic period 29.53 days, perigee 363,300 km, apogee 405,500 km (The mission compares the Moon with a roof at the same clock time: 360 / 29.53 = 12.2 degrees a day.) verified
- About 30 Earths fit between the Earth and the Moon (Model: 384,400 / 12,742 = 30.2.) verified
- Everest summit 8,849 m verified
- A fist at arm’s length covers about 10 degrees (Rule of thumb.) to verify
FIG. 04 Toaster
- HyperPhysics, Ohm’s law microscopic view (drift speed, copper electron density) verified
- Wikipedia, Draper point (525 °C) verified
- Wikipedia, Maillard reaction (browning above about 140 °C) verified
- Wikipedia, Toaster (bimetal strip, electronic timer and electromagnet) (varies by model) verified
- 0.75 mm2 cord section (common appliance cord size) to verify
- Toast time per shade (60 + 30 x shade seconds) (model value) to verify
- Eiffel Tower 330 m, official site (page not opened today) to verify
Privacy
No account. No tracking. No ads. Progress and your child’s numbers stay in this browser. Read-aloud may use your browser’s online voice service.
Settings
Some browsers use an online voice service for read-aloud. Recorded voices come in the next version.