Blecks have no sense of time. The units of time in Africa were and are, Asubuhi Mapema, Mchana, Jioni and usiku just the words change. Some communities marked time using events such as when animals returned from grazing.
Due to advanced levels of mediocrity blecks used to measure their goods by estimation. A goat or a ram was exchanged for a certain amount of grains measured by guesswork.
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Sometimes I wonder what befell Ancient Egyptians wakaenda na hiyo knowledge yao yote.