Johann Bernoulli had three sons, Nicolaus(1695 - 1726), Daniel(1700 - 1782), and Johann(II) (1710 - 1790), all of whom won renown as eighteenth – century mathematicians and scientists. Nicolaus, who showed great promise in the field of mathematics, was called to the St. Petersburg Academy, where he unfortunately died, by drowning, only eight months later. He wrote on curves, differential equation, and probability. A problem in probability, which he proposed from St. Peterburg, later became known as the Peterburg paradox. The problem is: if A receives a penny should head appear on the first toss of a coin, 2 pennies if head does not appear until the second toss, 4 pennies if head does not appear until the third toss, and so on, what is A’s expectation? Mathematical theory shower that A’s expectation is infinite, which seems a paradoxical result. The problem was investigated by Nicolaus’ brother Daniel, who succeeded Nicolaus at St. Petersburg.