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How do we know the temperature? A curious boy learns how to measure it. Làm th¿ nào ¿¿ bi¿t ¿¿¿c nhi¿t ¿¿ ¿ang nóng hay l¿nh nh¿?¿Có m¿t c¿u bé tò mò ¿ang r¿t mün h¿c ¿¿¿c cách ¿o nhi¿t ¿¿ ¿ây. Your purchase of this book supports Library For All in its mission to make knowledge available to all, equally.