At least in the US, that time frame is known for removing lead from gasoline and the beginning of disallowing smoking inside restaurants etc. So clearly, those harmful airborne particulates were bolstering our immune system. Without them… believe it or not, more autism.
It could also be the steady decline in the pirate population, though that’s more closely associated with the cause of global warming:
At least in the US, that time frame is known for removing lead from gasoline and the beginning of disallowing smoking inside restaurants etc. So clearly, those harmful airborne particulates were bolstering our immune system. Without them… believe it or not, more autism.
It could also be the steady decline in the pirate population, though that’s more closely associated with the cause of global warming:
Which mangaka wrote that graph’s x axis?
https://simple.m.wikipedia.org/wiki/Mangaka
TIL