Eratosthenes was a Greek polymath. He devised an algorithm for identifying primes (the sieve of Eratosthenes). His calculation of the earth’s circumference was known of but rejected by, Columbus, who reckoned about 25% less. Had Columbus accepted the calculation, he may well have founded a new world and not, as he believed, Asia. Eratosthenes was… Continue reading #OTD 24 April