One of the kids asked me "Daddy, how does flint make sparks?" So I dutifully searched the internet and found some fantastic explanations about how when struck with a bit of sharp flint, the iron shatters a little. The resultant tiny pieces of iron immediately react with oxygen and ignite, creating sparks. Fantastic stuff. The next question was, "Daddy, how does tinder work?" believe me folks, you really don't want to type in 'How tinder works?' on Google chrome....
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