Our fathers did not talk about psychology; they talked about a knowledge of Human Nature. But they had it, and we have not. They knew by instinct all that we have ignored by the help of information. — G. K. Chesterton

Eratosthenes of Cyrene

275–192 BC
Civilization: Greek — Alexandria
   Field of Renown:  science — Mathematics
Era:  Greco-Roman

Early Greek scientist from Alexandria who correctly predicted the precise size of the earth in 200 BC.

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University Professors of Two Thousand Years Ago in  Stories of the Great Scientists  by  Charles R. Gibson