The author develops the idea that humanity’s early fire-starting tools may have been dangerous because, using a stick in lava could’ve melted the stick and not lit a fire. Which is very harmful/dangerous. As with lightning that would be very dangerous because of the fact that lightning could hit you and you would most likely get electrocuted. Chemicals weren’t a good option either considering chemicals are bad to breathe in and sandpaper would’ve taken a while to wear out to light the match.
