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Arteries of learning

A teacher was giving a lesson on blood circulation. Trying to make the matter clearer, she said: "Now, 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?"

One loyal little charge shouted: "Cause your feet ain't empty."

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