The Perspective of Mathematicians

A mathematician, a physicist, and an engineer were traveling together in Scotland when they saw a black sheep in the countryside through the train window.
"Haha! I see all the sheep in Scotland are black!" exclaimed the engineer.

"Hmm, I think what you mean to say is that there are some sheep in Scotland that are black, right?" the physicist corrected the engineer's statement.

The mathematician interjected, "No, no! All we can conclude from what we know now is that there is at least one sheep in Scotland, and that sheep has at least one black side."