Wang Dafan endured all the way into modern society, and finally felt that things were beginning to change.
Someone had vaguely discovered his existence.
After all, this variable of his had played a similar role during many of humanity's crises.
For example, during a certain great plague.
He should have watched coldly from the sidelines, but he had no choice. The plague seemed to persist for over a century without disappearing.
In truth, people simply lacked too much knowledge.
He had originally spread relevant hygiene knowledge long ago.
But then Feudal Society was ravaged by barbarian invasions, causing a massive break in the transmission of knowledge.
It was like how Rome had bathhouses and springwater everywhere, only for people in the Middle Ages to wash themselves just twice in their entire lives.
That was actually because someone had a theory that bathing easily caused colds, since washing removed the body's protective layer...
That was right, they regarded grime as a protective layer.
They had completely forgotten that bathing easily caused colds because of drastic temperature changes. Rome had a Mediterranean Sea climate, with small temperature differences and frequent hot weather.
So it was fine.
Meanwhile, most of Europe was actually at a higher latitude than the northeastern regions of Great Xia.
It was only because warm currents passed through that it was not quite so cold.
But it was absolutely not hot either.
So Wang Dafan stepped in. He could not bear to watch his descendants die in such numbers because of foolish mistakes.
The result proved that he was not a qualified Grandfather.
And this sort of thing happened more than once.
The modern world.
Inside a historical archives.
An old man was organizing historical events.
He discovered this oddity and became deeply interested.
Why was it that whenever