A logician's wife is having a baby. The doctor immediately hands the newborn to the dad. The wife says, "Is it a boy or a girl?" The logician says, "Yes."
Did you hear about the math professor who was afraid of negative numbers?
He will stop at nothing to avoid them.
Did you hear about the weekly poker game with Vasco da Gama, Christopher Columbus, Leif Erikson, and Francisco Pizarro? They can never seem to beat the Straights of Magellan.