Quote:
Originally Posted by Stitchawl
And to wit... yes, friction is 'causing' the 'heating,' but WHAT is being heated and thrown off as 'spark?' What ARE sparks?
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Quote:
Originally Posted by SneakySnake
tiny broken bits of flint?
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Quote:
Originally Posted by Stitchawl
No... but you're close... 
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Some 'thing' has to be burning, and it's not the stone...
Stitchawl