Do walls have ears?

3.3
1. Put a mark on the same spot on one of the walls of your classroom, both inside and outside.

2. Put your ear against the mark on the wall from the inside of the classroom.

3. Ask your friend to go outside the classroom and hit the wall at the mark with a small pebble.

4. The person hitting with a pebble should do so gently so that the person behind the wall cannot hear the sound directly.

5. Now change the roles and try again.

Were you able to listen through the wall?

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