On the weight of the scales. PEGOV M.

This cognitive book tells about the scales: about their important role in human life, about how they appeared and served people for millennia. The young reader with interest learns that at first a person weighed everything with his own hands, then the oldest lever scales, scales-beads, and then spring scales were invented. Today, electronic scales are used everywhere, and how will the scales in the future surprise us? For senior preschool and primary school age.