Kariza loved to ask questions. She got this habit from her parents.
They used to tell her, "If you don't ask questions when you are young, you will grow up to be an ignorant adult!"
One day, Kariza asked her teacher, "Why do our parents always tell us to wash our hands before eating, even when our hands look clean?"
Her classmates liked her question. They didn't like being told to wash their hands!
The teacher answered, "Good question! Even when our hands look clean, they can still have germs on them."
She explained, "Germs cause illness. We can't see germs using only our eyes, we need something more powerful to see germs."
The teacher got a microscope from the cupboard. "A microscope is a tool we use to see things that are too tiny for the human eye to see," she said.
The teacher gently scraped Kariza's hands with a stick and then wiped it on a microscope slide.
The teacher put the slide on the microscope, and this is what they saw through the viewer.
Even though Kariza's hands did not look dirty, there were germs on them!

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