Biologist jokes

Why do cellular biologists always disagree with mathematicians?

Because to them dividing and multiplying are the same

A physicist, a biologist, and a mathematician are relaxing on a hill overlooking an abandoned house. They watch two people enter the house through a broken window. Time passes. Later they observe three people leave the house.

The physicist says, "Our measurements weren't accurate."

The biologist says, "They must have reproduced."

The mathematician says, "If one more person goes inside, the house will be empty."