Alison Free Online Courses: IT, Health, Management, Teaching, Engineering
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Thousands of kilometers underground, it is very hot, so hot that the rock melts away from its organic state to its liquid state. The liqui...
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The importance of friends Having a weak circle of friends carries the same risk as smoking 15 cigarettes a day. Researchers suggest that t... -
In the universe, everything is in motion. The moon revolves around the earth, which itself revolves around the sun. An eclipse is the alig...
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