Math in Everyday Life
Three men were sitting on a park bench, a biologist, a physicist, and a mathematician. They saw two people walking on the opposite side of the street and into an apartment building. Later on, the two people walked out, but with a third person with them. This puzzled the three men.
“The first two must have reproduced,” explained the biologist.
“That’s not right,” objected the physicist, “there was already another person in the building.”
“You’re both wrong!” exclaimed the mathematician. “They didn’t reproduce and there was nobody in the building, but if one more person enters that building, it will be completely empty.”