A physicist, a mathematician, and an engineer are taking a rail
trip through Scotland. Gazing out the window, they see a black sheep.
The engineer says, "How interesting! Scottish sheep are black!"
"No, no," says the physicist, "we only know that some Scottish
sheep are black."
The mathematician heaves a deep sigh, and says, "We know that
there exists at least one sheep in Scotland, at least one side of which
is black."
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