Cool. A watch powered by lemonade. But does this also work with other liquids? Try it out. An eco-battery to build yourself With this experiment set, children discover that the power does not always have to come out of the socket. Electrical chemistry makes it possible When assembling the springs, cables and other electronic components, children learn about the construction of circuits - the instructions show exactly how to do it A clever gift from Kosmos with wow effect For children aged 8 to 12 years
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