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- 12. Civilization is the result of culturethat engorge people for invention.بيبيببببيبببيبيبسييسيسيسييسنمسميبةوروزو{ؤءر
- 27. Oil first used in lighting instead of using candles made from animal fat and in that time they discovered the importance of oil in 1845.
- 29. In 1870, the production of one ton of clinker (the main ingredient of cement) takes 40 hours, now takes only 3 minutes.