Blood Circulation
A teacher was giving a lesson on the circulation of the blood. Trying to 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 your feet ain't
empty.”