A crash course in changing the world.
I found an experiment in the internet, you can find it here. I’m sorry, the link is only German. It is an instruction to clean water only with a plastic bottle, sand, a cutter, pebbles, absorbent cotton, a hand of earth and two gla****.
It makes it possible to show children with very easy means that it is easy to make water clean, but that it is even more easy to make it dirty, waste and deadly. I showed it a friend of me, she is the teacher of a first and third class of primary school. She will make this experiment with her kids, I think this is a good possibility to show the children the risks of using water too careless.
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