Android app · in testing
Cut open.
Explained.
How does a jet engine survive gas hotter than its blades can stand? Why is a tree made mostly from air? Tech Explained turns 30 everyday things into interactive 3D cutaways, with a live physics model behind every part.
Free. No ads, no account, no tracking. In English and German.
What happens inside
Start whole. Cut it open. Pull it apart.
Every object begins in one piece. Cut it open, explode it into its parts, then let a guided tour fly the camera from part to part, with live values right on the parts.
Human heart
Two pumps in one beat. Switch from rest to run and watch heart rate, pressure and flow follow.
Noise-cancelling headphones
A microphone hears the noise and the speaker plays its mirror image, so the two waves cancel.
Microwave oven
A transformer steps the mains up to about 2,000 volts for the magnetron, whose microwaves shake the water in your food.
Satellite in orbit
556 km up and falling around the Earth at 7.6 km/s: once every 96 minutes, with a cold plunge through the Earth’s shadow.
MRI scanner
A magnet about 30,000 times stronger than the Earth’s field makes the protons in your body send back radio signals.
Tree
About 90 % of its dry wood comes out of the air: carbon and oxygen from CO₂, joined to hydrogen from water with the energy of sunlight.
More than a picture
Predict, test, find the flaw, go deeper.
Mysteries
Predict first, then test it in 3D. Wrong guesses are the best ones: the model shows you why.
Spot the mistake
Each object hides explanations with one wrong sentence. Judging whether a confident explanation is true is the key skill in the age of AI.
Rabbit holes
Every part leads to about 300 principles of physics, chemistry, biology and maths, with real formulas, small experiments and where they come up in school.
Feel it
Tilt your phone to ride the bike or fly the drone, play the electric guitar, hear the heart valves close. Sound and vibration follow the physics.
For every age
Simplified where it has to be. Never wrong.
Two reading levels over the same drawings: one for curious kids of about 8 to 12, one for teens and adults.
The numbers come from tested models and published data, and every object is reviewed for accuracy. Made by an aerospace engineer who wants everyone to understand the technology around them.
30 objects
Help bring it to Google Play
Become one of the first testers.
Google publishes a new app only after at least 12 people have tested it for 14 days in a row. If you have an Android phone, you can help.
Send a short email with the Google account address you use on that phone. You get an invitation link, install Tech Explained from Google Play like any app, and keep it for two weeks. Feedback is welcome, never required.
Your address is used only to add you to the test in Google Play. See the privacy policy.