Who Invented Gears?
Por um escritor misterioso
Descrição
Today’s Wonder of the Day really kicks things into high gear!
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Do you remember him? A better question, do you even know him? He
Leonardo da Vinci worked on the gears improvement; he invented
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Who Invented Gears?
Gears evolved in nature long before humans 'invented' them
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por adulto (o preço varia de acordo com o tamanho do grupo)
