This is a science experiment, very funny!
You need: half a lemon, some water, a spoon, a bowl, a cotton bud, white paper, a lamp.
Instructions: 1 Put some lemon juice and water in the bowl.
2 Mix the lemon juice and water with the spoon.
3 Put one end of the cotton bud in the lemon juice.
4 Write a message on the paper with the cotton bud.
5 Wait for the message to dry.
6 Hold the paper near the lamp to heat. Now you can read the message! Would you like to try?