Ice Fishing with Salt and String
String picks up the ice cube.
Teaching & key ideas
What you do: Lay wet string on ice, sprinkle salt, wait ~30 sec, lift.
What students see: String picks up the ice cube.
Why it works: Salt melts a thin layer; diluted water can refreeze around the string.
Question to ask: How did the string get 'stuck' to ice?
Lesson flow
Predict → demonstrate → observe → briefly explain → ask: How did the string get 'stuck' to ice?