Microbes are a very interesting topic. Cheap light microscopes are often sufficient to see plankton, algae and protozoa. Gather water from ponds, ditches, puddles on the road and the drain. Pipette a small drop onto a slide, place a cover glass and place under the microscope to see what you find. With this you can discuss, how important hygiene is and interest the child to all of the various life forms than can be seen from all sorts of different places. If you have several children of your own or in the family/ neighborhood, you can have a "who can find the coolest microbe" contest, with maybe a sticker or ice cream for a prize.
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