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on the beginning the sun was being turned with the mass, of the milky way it was 4 billion b.c. ago. for the whole timeline it is all in this source.SOURCE:http://www.mts.net/~william5/history/hol.htm
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homo erectus was the first to find out that big fire is dangerous because one time a lightning bolt shot a tree and made a big fire so 400,000 B.C. ago they would use small fires torches and flames.