Take a raw carrot, and hold it to a bare flame. Nothing much happens
except some charring and bad smell.
Place some liquid fat (oils) in a shallow dish prepared with a wick.
Touch a match to the saturated wick, and observe the heat and light
that results. This is one of the oldest kinds of light source known
to humankind.
Take some solid fat, meat trimmings or tallow, or left over fat
globules from meat dishes. A match might be sufficient to start a
flame, or a bit more heat could be needed.
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