Puzzle 21: Fire Starter
TRIVIA
The ability to make fire played a big role in human development.
Early fire-starting was done by striking stones (typically flint) together to create a spark.
Matches are a relatively modern invention. Early chemical matches were expensive, inconvenient, and sometimes dangerous.
The friction matches that we use today started from an invention in 1826 by John Walker, an English chemist. Like so many inventions, Walker made the discovery somewhat by accident. He was working on trying to create a chemical match, but it was only when one accidentally lit by friction on the hearth that he realised its potential.
Wikipedia: Match