An engineer, an experimental physicist, a

theoretical physicist, and a philosopher were hiking through the hills of

Scotland. Cresting the top of one hill, they see, on top of the
next, a
black sheep. The engineer says: “What do you know, the sheep
in Scotland
are black.” “Well, *some* of the sheep in Scotland are
black,”
replies the experimental physicist. The heoretical physicist
considers this
for a moment and says “Well, at least one of the
sheep in Scotland is
black.” “Well,” the philosopher responds, “on one
side,
anyway.”