Three friends are having lunch in a café when…

…a couple walks into an abandoned building across the street, and they come out with a child.

The first friend, a biologist, notes, "They've reproduced."

The second friend, a statistician, remarks, "No, don't you get it? There's 2.5 people going each way."

The third friend, a mathematician, corrects, "You're both silly. It's blindingly simple! If someone walks in now, the building will be empty."

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