| Circulatory Lesson
A teacher was giving a lesson on the circulation of the blood.
Trying make the matter clearer, she said, "Now, class, if I stood on
my head, the blood, as you know, would run into it, and I would turn red
in the face."
"Yes," the class said.
"Then why is it that while I am standing upright in the ordinary position
the blood doesn't run into my feet?"
A little fellow shouted, "Cause yer feet ain't empty."
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