How does a glass screen know exactly where your finger is?
Open for the projector Present it step by step
Classroom mode
A question for the whole room
One story to open. A room full of ideas to test.
Ready in three steps
- Open the story.Read and try the first pages together.
- Pause for a prediction.At the story’s question, read its choices aloud. Invite a vote and ask, “What makes you think that?”
- Run it. Watch. Wonder.Choose the class’s prediction, run the experiment, and compare what happened with your guesses.
Different guesses are welcome. The experiment gives everyone something to rethink.
Something to put on paper
A one-page prediction and observation sheet. No answers included.
After the experiment: discussion notes
Talk about what happened
- Predict before testing: will a wool glove work if you press as hard as you can? Why or why not?
- Predict whether a metal spoon and a plastic pencil will work the same on a touchscreen — then explain your reasoning using the word 'electricity'.
- If the screen senses charge instead of pressure, predict what would happen if two fingers touched at once. How could one chip track both?
Where it shows up in real life
- Tapping a phone with winter gloves on and being ignored, then working bare-fingered.
- A rain-wet or sweaty screen tapping itself with ghost touches.
- Pinching to zoom on a map or photo with two fingers at the same time.
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