The only cow in a village in Poland stopped giving milk.
The people did some research and found that they could buy a cow from Moscow for 2,000 rubles, or one from Minsk for 1,000 rubles. Naturally they bought the cow from Minsk. It produced lots of milk and the villagers were very happy.
They decided to acquire a bull to mate with the cow so they would never worry about the milk supply again.
However, whenever the bull came close to the cow, the cow would move away. No matter what approach the bull tried, the cow would move away from the bull and he could not succeed in his quest.
The people were very upset and decided to ask the rabbi, who was very wise, what to do.
"Whenever the bull approaches our cow, she moves away.
If he approaches from the back, she moves forward.
When he approaches her from the front, she backs off.
An approach from the side and she just walks away to the other side."
The rabbi thought about this for a minute and asked, "Did you buy this cow from Minsk?"
The people were dumbfounded, since they had never mentioned where they had gotten the cow." You are truly a wise rabbi. How did you know we got the cow from Minsk?"
"My wife is from Minsk."