One exceptionally pleasant day a mathematician, a physicist and a biologist decided to lunch at a nearby sidewalk café. As they sat eating, they observed the people coming and going around them. They watched as across the street one person, then another entered a building. A few minutes later, the two original people left in the company of a third.
"Did you see that?" said the biologist, "They reproduced!."
"Don't be silly.", said the physicist, "There was clearly a measurement error."
"You are both very funny.", said the mathematician, "It's obvious that if exactly one more person enters that building it will be empty."
"Did you see that?" said the biologist, "They reproduced!."
"Don't be silly.", said the physicist, "There was clearly a measurement error."
"You are both very funny.", said the mathematician, "It's obvious that if exactly one more person enters that building it will be empty."