Geographies

The very idea that tens of millions of people across different classes and races and geographies might hold similar views on a range of subjects just because they happened to be born during the same 20-year span of American history — the whole thing sounds a bit too much like astrology, doesn’t it?

The other great work of Eratosthenes was his “Geographies,” including all previous knowledge on the subject, just as the “Elements” of Euclid had included all previous mathematical knowledge.