He selected two dry soft branches to demonstrate fire-making with wood.
He gathered all the adults and children to watch.
This was never an easy task and required a lot of time and effort.
But if the campfire went out, mastering this skill could save the entire family, and everyone was willing to wait.
If many people tried fire-making together, someone would eventually get lucky and make a fire quicker.
He kept drilling the wood and found it really laborious.
A few times smoke appeared, but no sparks were generated.
Doing this would make the arms very tired, and it was easy to get blisters on the hands.
But this was a life-saving skill that must be mastered.
After half an hour, he finally succeeded.
He told the primitive people here that this skill was very important, and it's best if everyone could learn it.
These people were usually very anxious about the campfire, fearing it would go out.
Now that they knew this good method, how could they not try it?
