AMMAN — Two Jordanian students have topped the “SAMA” global mental math competition, snatching first and third place each in a category. Summit Abacus and Mental Arithmetic Association (SAMA) is a ...

Today, 12- to 14-year-olds around the country crack the Vigenere using common factors. And Navajo code talkers, using a cipher based on their native language, were famous for aiding the Marines at ...