A teacher was giving a lesson…

A teacher was giving a lesson on the circulation of the blood. Trying to make the matter clearer, he said: " Now, students, 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 boys 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, " 'It's because yer feet ain't empty. "

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