post the nerdiest joke you know

[RoundTower]

An astronomer, a physicist and a mathematician are in Scotland for the first time. While on the train to Glasgow, they see a brown cow in a field. The astronomer looks out the window and says "look, cows in Scotland are brown!" The physicist looks out and says "I wouldn't go that far. Some Scottish cows are brown." The mathematician looks out on the same scene, turns back, and tells them "There is at least one field in Scotland, containing at least one cow, at least one side of which is brown."