Joke: A teacher was giving a lesson on blood circulation. Trying to make the matter clearer, he said "Now, students, if I stood on my head the blood, as you know, would rush into it, and I should turn red in the face."
"Yes, sir." the boys
"Then why is it that while I am standing upright in the ordinary position, my feet don't turn red from blood?"
Little Johnny shouted "It's because your feet aren't empty."
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