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Since the appearance of humanities on earth, and since human beings started to have activities, the need for measuring units appeared. Measuring weight, distance (length) and time …
Wanted: Space Pioneers (and readers ) aged 11-14For a limited time, Middle-Grade readers can get a FREE PDF copy with their parent's permission, in exchange for a fair review …
Since the appearance of humanities on earth, and since human beings started to have activities, the need for measuring units appeared. Measuring weight, distance (length) and time …