The number seven was chosen because the Greeks believed it to be the representation of perfection and plenty because it was the number of the five planets known anciently plus the sun and moon.
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kwa yashi123zaidi ya mwaka mmoja uliopita
The Google Science Fair is an online science competition which invites 13–18 mwaka old students around the globe to participate and submit their innovative ideas to change the world.
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kwa yashi123zaidi ya mwaka mmoja uliopita