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Dirt
Have you ever wondered how clean your classroom is? Have you ever thought it might look clean to the naked eye? Well, clean and dirty are a matter of perspective in the end. Microorganisms (bacteria, fungi and viruses) surround us in our everyday life. They are in our homes, on our things, at school, in the streets, on our food and even when we are playing our favorite sport.
But this is not necessarily bad. Microorganisms are important for us and the human body is used to or - in some cases - even dependent on the coexistence with microorganisms in everyday life. Show us how and where we encounter microorganisms, viruses and bacteria in our everyday life. Of course there are cases or areas where the presence of microorganisms is good and cases or areas where microorganisms are bad for our bodies.
Small Organisms: Microbes are the earliest and most resilient forms of life on earth. Microbiology is biology under a microscope. It deals with organisms that you can't usually see.
Dirty And Clean: There are certain areas in our life (for example public toilets, dog poo etc.), which are perceived as being 'nasty' and 'untouchable'. There are other areas, which we presume as 'clean' even though they are at least as covered by germs. Hence, there might be a lot of microorganisms, viruses, bacteria and other germs in your classroom.

Microorganisms, Bacteria, Fungi, Viruses, Germs, Cleanliness, Human body, Dirt

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