A teacher asks a student to write an essay using invisible ink. The next day, the student hands in a blank sheet of paper.
What does the teacher say?
In many liquor stores, you can buy pear brandy, with a real pear inside the bottle. The pear is whole and ripe, and the bottle is genuine; it hasn't been cut in any way. How did the pear get inside the bottle?
How can you put an egg which is 5 cm in diameter into a bottle with a mouth that is 2 cm in diameter? You may not damage the bottle in any way.
I am black as night but filled with light. I can be seen, even through a screen. I hold many secrets, waiting for them to be discovered. What am I?
