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Blood Circulation
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- A teacher was giving a lesson on the circulation of blood.
Trying to make the matter clearer,
he said: "Now class, if I stood on my head, the blood as you know,
would run into it and I should turn red in the face."
"Yes, sir," the class said.
"Then why is it that while I am standing upright in an ordinary
position the blood doesn't run into my feet?"
A class member shouted, "'Cause your feet ain't empty."