Fire

1. . . . the first chemical reaction used in a controlled manner was fire.
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4. He's making the stick turn round and round very quickly.  
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6. His son may have moved on to a bow as in bow and arrow, with the string looped around the stick
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8. Find a dictionary and look up friction.
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10. However, for millennia thousands of years fire was seen simply as a mystical mystery force that could transform change one substance into another (burning wood, or boiling water) while producing heat and light. 
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12. Fire affected many aspects of early societies.  more
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14. These ranged from the simplest aspects of everyday life, such as cooking and habitat the local area where they live .....  , heating and lighting, to more advanced uses, such as making pottery and bricks and melting ... metals to make tools. 

source  not including the cave people (from other images here).

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