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.'
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