• a dispenser of tape
• a friend

1. Grab a long piece of tape for yourself... pull it off the roll quickly, so it makes a good noise. Have your friend take another piece of tape that's about the same size.
2. Let the two pieces hang down and slowly bring them towards each other.
3. As they come closer to each other, they seem to push away.

Why do the pieces of tape push away from each other?

air pressure pushes them
they have the same electrical charge on them
they have different electrical charges on them

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